2021/12/28 更新

写真a

スナツキ ユキナリ
砂月 幸成
SUNATSUKI Yukinari
所属
自然生命科学研究支援センター 助教
職名
助教
外部リンク

学位

  • 博士(理学) ( 熊本大学 )

研究キーワード

  • coordination chemistry

  • 錯体化学

研究分野

  • ナノテク・材料 / 無機・錯体化学

学歴

  • 熊本大学    

    - 1998年

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    国名: 日本国

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  • 熊本大学   Graduate School, Division of Science and Technology  

    - 1998年

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  • 熊本大学   Faculty of Science  

    - 1993年

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    国名: 日本国

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  • 熊本大学   Faculty of Science   Dpartment of Chemistry

    - 1993年

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経歴

  • - 岡山大学自然生命科学研究支援センター 助教

    2004年

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  • - Assistant Professor,Advanced Science Research Center,Okayama University

    2004年

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  • Postdoctoral Fellowships of Japan Society for the Promotion of Science

    2002年 - 2003年

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  • 岡山大学 日本学術振興会特別研究員

    2002年 - 2003年

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  • 生研機構 博士研究員

    1998年 - 2000年

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所属学協会

 

論文

  • Field-induced single-ion magnet behaviors in 1-dimensionally assembled tetrahedral cobalt(II) complexes with halide donors

    Ryoji Mitsuhashi, Satoshi Hosoya, Yukinari Sunatsuki, Takayoshi Suzuki, Masahiro Mikuriya

    INORGANICA CHIMICA ACTA   529   2022年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Three tetrahedral cobalt(II) complexes [CoX2(H2thp)2] were prepared and characterized (H(2)thp = 2-(1,4,5,6tetrahydropyrimidin-2-yl)phenol, X = Cl, Br, and I). X-ray crystallographic analysis indicates that the H2thp ligand coordinates to a Co ion in monodentate fashion in zwitterionic form. In the crystal, all the complexes formed characteristic one-dimensional chain structures via N-H center dot center dot center dot X hydrogen-bonding interactions. The static magnetic measurements showed that the g-factors and axial zero-field splitting parameters for Br- and I- derivatives are quite similar despite the deference in the halide ligand. A significant frequency dependence was observed for all the complexes in dynamic magnetic measurements in the presence of an external field. The relaxation dynamics below 3 K for the Br- and I- derivatives were found to be dominated by Raman relaxation process, while that of the Cl- derivative was dominated by Orbach process. The relatively long intermolecular Co center dot center dot center dot Co distances > 8 angstrom resulted in no influence in the static magnetic properties and the QTM phenomena.

    DOI: 10.1016/j.ica.2021.120667

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  • Synthesis of Nilotinin M3: An Ellagitannin Containing an Isodehydrodigalloyl Group

    Haruka Imai, Yuta Kanzaka, Yukinari Sunatsuki, Hitoshi Abe

    SYNTHESIS-STUTTGART   53 ( 19 )   3630 - 3638   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GEORG THIEME VERLAG KG  

    Total synthesis of nilotinin M3, which is a member of the ellagitannin family of natural products containing an isodehydrodigalloyl (isoDHDG) group, was achieved using the Ullmann reaction to construct a highly functionalized diaryl ether.

    DOI: 10.1055/a-1508-9541

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  • Versatility of coordination modes of N'-(pyridin-2-ylmethylene) picolinoylhydrazidate in the mononuclear cobalt(III) and polynuclear cobalt(II) complexes

    Daniel K. B. Acheampong, Kei Kirihara, Rina Ogawa, Yukinari Sunatsuki, Takayoshi Suzuki

    INORGANICA CHIMICA ACTA   525   2021年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Molecular and crystal structures of the mononuclear cobalt(III) complexes bearing N'-(pyridin-2-ylmethylene) picolinoylhydrazidate (Lpy-), [Co(Lpy)3] (1) and [Co(Lpy)2]BF4 (2a and 2b), as well as those of the Lpy-bridged CoIII2CoII trinuclear and CoII4 tetranuclear complexes, [Co3(Lpy)4(H2O)2](BF4)4 (3) and [Co4(Lpy)4Cl2(CH3CN)2] (BF4)2 (4), were determined by the single-crystal X-ray diffraction method, which revealed a variety of coordination and bridging modes of the multidentate Lpy- ligand. The protonated free hydrazone, HLpy, exists as an E-form (in regard to the imine configuration) in the solid state and in solution. In the mononuclear CoIII complexes, the hydrazonate anion (Lpy-) coordinates to a CoIII center in three different coordination modes: a bidentate kappa 2N1,N2 mode with the E-form (in 1) and two kinds of tridentate modes with the respective configuration, Z-kappa 3N1,N2,N4 and E-kappa 3O,N3,N4, in 2a and 2b. The former tridentate mode was sterically favored in the CoIII complexes, resulting in the five- and six-membered chelate rings, with a conversion of the imine configuration during the complexation. Complex 2a could also serve as a complex ligand toward a CoII ion with the kappa 2O, N3 mode, forming the CoIII-CoII-CoIII trinuclear complex (3). In the novel tetranuclear CoII complex (4), the ELpy- hydrazonates bridged two CoII ions in two different modes: mu-kappa 2O,N1:kappa 3O,N3,N4 and mu-kappa 2N1,N2:kappa 3O,N3,N4, where all chelate coordinations formed a five-membered ring with the CoII ion.

    DOI: 10.1016/j.ica.2021.120464

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  • Zero-field slow relaxation of magnetization in cobalt(ii) single-ion magnets: suppression of quantum tunneling of magnetization by tailoring the intermolecular magnetic coupling

    Ryoji Mitsuhashi, Satoshi Hosoya, Takayoshi Suzuki, Yukinari Sunatsuki, Hiroshi Sakiyama, Masahiro Mikuriya

    RSC ADVANCES   10 ( 71 )   43472 - 43479   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    The correlation between magnetic relaxation dynamics and the alignment of single-ion magnets (SIMs) in a crystal was investigated using four analogous cobalt(ii) complexes with unique hydrogen-bond networks. The hydrogen-bonding interactions in the crystals resulted in a relatively short intermolecular CoMIDLINE HORIZONTAL ELLIPSISCo distance, which led to non-zero intermolecular magnetic coupling. All the complexes with a CoMIDLINE HORIZONTAL ELLIPSISCo distance shorter than 6.5 angstrom exhibited zero-field slow magnetic relaxation as weak magnetic interactions split the ground +/- M-s levels and suppressed quantum tunneling of magnetization (QTM). In particular, antiferromagnetically coupled one-dimensional chain SIM networks effectively suppressed QTM when the two intrachain CoMIDLINE HORIZONTAL ELLIPSISCo distances were non-equivalent. However, when the two distances in a chain were equivalent and each molecular symmetry axis aligned parallell within the chain, QTM suppression was insufficient because magnetic coupling from the adjacent molecules was virtually cancelled. Partial substitution of the Co-II ion with the diamagnetic Zn-II ion up to 33% for this complex resulted in complete QTM suppression in the absence of an external field. These results show that the manipulation of intermolecular distances and alignments is effective for suppressing undesired QTM events in SIMs.

    DOI: 10.1039/d0ra08286d

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  • Sterically Demanding 8-(Diphenylphosphino)quinoline Complexes of Group 10 Metal(II): Synthesis, Crystal Structures, and Properties in Solution

    Masatoshi Mori, Yukinari Sunatsuki, Takayoshi Suzuki

    INORGANIC CHEMISTRY   59 ( 24 )   18225 - 18240   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    Several series of platinum(II), palladium(II), and nickel(II) complexes bearing 8-(diphenylphosphino)quinoline (PQ(H)) or its 2-methyl or 2-phenyl derivatives (PQ(Me) or PQ(Ph)) were synthesized, and their crystal structures and behaviors in solution were investigated. Most of the complexes [M(PQ(R))(2)]X-2 (M-II = P-II, Pd-II, or Ni-II; R = H, Me or Ph; X = monoanionic ions) characterized in this study have an approximately square-planar coordination geometry with two bidentate P,N-chelating or monodentate P-donating quinolylphosphine ligands in the cis(P,P) configuration. A large steric requirement from the Me or Ph substituent introduced at the 2-position of the quinoline ring gives the resulting complexes severe distortion. The Pt-II and Pd-II complex cations maintained the square-planar coordination geometry, but the M(II )center was displaced from the chelating ligand plane. This bending of the chelate coordination makes the M-N(quinoline) bond weaker, as demonstrated by the longer M-N bonds. In accord with the bond weakening, the partial dissociation of the PQ(H) or PQ(Me) chelates by substitution with halide anions were observed using UV-vis spectroscopy and X-ray crystallography. In contrast, the PQ(Ph) complexes were stable in solution toward the addition of halide anions; the intramolecular pi-pi stacking interaction between the coordinating quinolyl and the 2-substituted phenyl rings protects the M-II center from nucleophilic attack. In the corresponding Ni-II complexes, the steric congestion arising from the mutually cispositioned PQ(R) ligands resulted in a larre tetrahedral distortion around the Ni-II center. However, the intramolecular pi-pi stacking interaction was still effective in the PQ(Ph) complex, and this interaction can explain some unusual robustness and electrochemical properties of the Ni-II-PQ(Ph) complex.

    DOI: 10.1021/acs.inorgchem.0c02706

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  • Iron(II) Complexes Having Dinuclear Mesocate or Octanuclear Bicapped Trigonal Prism Structures Dependent on the Rigidity of Bis(bidentate) Schiff Base Ligands Containing Imidazole Groups

    Tsubasa Tanaka, Yukinari Sunatsuki, Takayoshi Suzuki

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   93 ( 3 )   427 - 437   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

    Dinuclear complex, [Fe-2(H2L1'(Me))(3)](ClO4)(4) (1Me, H(2)L1,(Me) = N,N'-(1,3 -phenylene)bis (1 -(5 -methyl-1H-imidazol-4-yl)methanimine)), and octanuclear complexes, [Fe-8(H2L2,H)(12)](ClO4)(16 )(2HClO: H2L2,H = N,N'-(1,3-phenylenebis(methylene))bis-(1-(1H-imidazol-4-yl)methanimine) and [Fe-2(H2L2'(Me))(12)](X)(16) (2MeX: H2L2,Me = N.N'-(1,3 -phenylene))bis-(methylene))bis- (1-(5-methyl-1H-imidazol-4-yl)methanimine), X = ClO4, BF4), were synthesized. It was revealed by X-ray analysis that 1Me has a dinuclear mesocate structure. On the other hand, 2HClO4 and 2MeX have novel octanuclear bicapped trigonal prism structures with six iron(II) sites having the meridional configuration on vertexes and two iron(II) sites having the facial one on the centers of each triangular base. Magnetic susceptibility studies indicated that these dinuclear and octanuclear complexes show gradual spin-crossover (SCO) behavior.

    DOI: 10.1246/bcsj.20190360

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  • Synthesis and magnetic properties of tetrahedral tetranuclear iron(II) complexes with bis(bidentate)-type Schiff bases containing imidazole groups

    Tsubasa Tanaka, Yukinari Sunatsuki, Takayoshi Suzuki

    INORGANICA CHIMICA ACTA   502   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Two new tetranuclear iron(II) complexes, [Fe-4(H2LH)(6)](ClO4)(8) (1ClO(4): H2LH = N,N'-bis(imidazole-4-ylmethylidene)-1.4-diaminobenzene) and [Fe-4(H2LMe)(6)](BF4)(8) (2BF(4): H2LMe = N,N'-bis(5-methylimidazole-4-ylmethylidene)-1.4-diaminobenzene), were synthesized from Fe(ClO4 or BF4)(2)center dot 6H(2)O, 1.4-diaminobenzene and 4-formylimidazole or 5-methyl-4-formylimidazole. X-ray analysis revealed that these complexes have a tetrahedral structure with four iron(II) ions at the apexes and the bridging bis(bidentate) ligands on the edges. The internal space of the tetrahedron was filled with the phenylene segments of the bridging ligands. Magnetic susceptibility studies indicated that both 1ClO(4) and 2BF(4) showed gradual but incomplete spin-crossover (SCO) behavior, because the densely packed tetrahedral structure could prevent the contraction of the Fe-N bonds on the highspin to low-spin transition.

    DOI: 10.1016/j.ica.2019.119373

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  • Transition-metal(II) complexes with a tripodal hexadentate ligand, 1,1,1-tris[2-aza-3-(imidazol-4-yl)prop-2-enyl]ethane, exhibiting incomplete total or absolute spontaneous resolution

    Misaki Matsushima, Koki Wada, Yuki Horino, Kazuma Takahara, Yukinari Sunatsuki, Takayoshi Suzuki

    CRYSTENGCOMM   22 ( 3 )   458 - 466   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    Crystal structures and crystallisation behaviours of a series of first-row transition-metal(II) complexes bearing 1,1,1-tris[2-aza-3-(imidazol-4-yl)prop-2-enyl]ethane (H3L), [M-II(H3L)]Cl(ClO4) (M = Mn, Fe, Co, Ni and Zn) were examined. These compounds crystallise in an orthorhombic crystal system with a non-enantiogenic (Sohncke) space group P2(1)2(1)2(1), resulting in spontaneous resolution of the chiral complex cations. Hydrogen bonds between the imidazole N-H atoms in the tripodal ligand and chloride anions give enantiomorphic crystals with a homochiral three-dimensional network structure. In order to verify the spontaneous resolution of these compounds, solid-state circular dichroism spectra of the resulting single crystals were measured (KBr disk method). Unexpectedly, the observed spectra indicated that imbalanced formation of the enantiomorphic crystals (i.e., left-handed Lambda-form vs. right-handed Delta-form complex cations) in all cases. Moreover, in the cases of Ni-II and Zn-II compounds, predominant enantiomorphic crystals formed by spontaneous resolution were always the same (in at least ten of our recrystallisation experiments). These observations suggest that there is a certain (but as yet unknown) factor that affects the predominant deposition of either enantiomorphic crystal when spontaneous resolution takes place from a solution of a racemic mixture in which rapid racemisation occurs.

    DOI: 10.1039/c9ce01864f

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  • Tetra- and dinuclear manganese complexes of xanthene-bridged O,N,O-Schiff bases with 3-hydroxypropyl or 2-hydroxybenzyl groups: ligand substitution at a triply bridging site 査読

    Ogawa Rina, Suzuki Takayoshi, Hirotsu Masakazu, Nishi Noriyuki, Shimizu Yuu, Sunatsuki Yukinari, Teki Yoshio, Kinoshita Isamu

    DALTON TRANSACTIONS   48 ( 36 )   13622 - 13629   2019年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9dt03007g

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  • Hydrogen-bonding interactions and magnetic relaxation dynamics in tetracoordinated cobalt(ii) single-ion magnets 査読

    Mitsuhashi Ryoji, Hosoya Satoshi, Suzuki Takayoshi, Sunatsuki Yukinari, Sakiyama Hiroshi, Mikuriya Masahiro

    DALTON TRANSACTIONS   48 ( 2 )   395 - 399   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c8dt04537b

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  • Synthesis, structure, and properties of di-mu-phenoxo-bridged dinuclear (CuNiII)-Ni-II and (CuCoII)-Co-II complexes and cyclic di-mu-phenoxo-mu-amido-bridged tetranuclear (Cu2Zn2II)-Zn-II and Cu-4(II) complexes derived from the 1,2-bis(2-oxidobenzamidato)benzenecuprate(II) dianionic ligand-complex 査読

    Y Sunatsuki, T Matsuo, M Nakamura, F Kai, N Matsumoto, JP Tuchagues

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   71 ( 11 )   2611 - 2619   1998年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

    Dipotassium N,N'-1,2-phenylenebis(2-carbamoyl-kappa N-phenolato-kappa O]cuprate(II)), K-2[CuL], reacts with nickel(II), cobalt(II), and zinc(II) acetates, and 2,2'-bipyridine in a 1:1:2 molar ratio in methanol to yield the hetero-metal dinuclear complexes [CuLNi(bpy)(2)]. 3MeOH(1.3MeOH), [CuLCo(bpy)(2)]. 2DMF (2.2DMF), and [CuLZn(bpy)(2\)]. 1.5H(2)O (3), respectively. Crystal data for 1: P (1) over bar (No: 2) with a = 15.969(2), b = 23.494(3), c = 12.705(2) Angstrom, alpha = 92.15(1), beta = 91.652(10), gamma = 101.521(9)degrees, V = 4663(1) Angstrom(3), and Z = 4; 2, P2(1)/c (No. 14) with a = 12.604(3), b = 24.364(5), c = 13.823(2) Angstrom, beta = 94.49(1)degrees, V = 4231(1) Angstrom(3), and Z = 4. 1 and 2 have a similar discrete di-mu-phenoxo- bridged dinuclear structure, in which the Cu(II) ion assumes a square-planar geometry with the N2O2 donors atoms consisting of two amido nitrogen and two phenoxo oxygen atoms of the tetradentate ligand, and the Ni(lI) or Co(II) ion assumes an octahedral geometry with the two phenoxo oxygens of the tetradentate ligand and four nitrogen atoms from two bpy. The magnetic-susceptibility data were reproduced based on the isotropic spin Hamiltonian H = - 2JS(1).S-2 With J = - 118.0 cm(-1), (S-1, S-2) = (1/2, 1) for 1 and J = -11.0 cm(-1), (S-1, S-2) = (1/2, 3/2) for 2, respectively. When 3 was recrystallized from DMF/2-propanol, [CuLZn(bpy)](2). 2DMF (3') was obtained. The 1: 1 :1 reaction of K-2[CuL'], copper(II) acetate monohydrate, and 2,2'-bipyridine in methanol yielded [CuL'Cu(bpy)](2). 2MeOH (4), (H4L' =1,2-bis(hydroxybenzamido)-ethane). Crystal data for 3': Pbca (No. 61) with a = 19.143(2), b - 18.195(2), c = 16.832(3) Angstrom, and Z = 4; 4, P2(1)/n (No. 14) with a = 13.407(1), b = 13.172(4), c = 13.764(2) Angstrom, beta = 94.11(1)degrees, V = 2424.4(8) Angstrom(3), and Z = 4; 3' and 4 have a similar cyclic di-mu-phenoxo-mu-amido-bridged tetranuclear structure, which can be described as two di-mu-phenoxo-bridged dinuclear units bridged together by the coordination of one amido oxygen atom from each dinuclear unit to the zinc(II) or copper(II) ion of the other dinuclear unit, with Zn(1)-O(3)* = 2.004(3) and Cu(2)-O(4)* = 1.924(4) Angstrom bond distances, respectively. In the tetranuclear structure, the copper(ll) ion coordinated by the tetradentate ligand assumes a square-planar geometry and the zinc(II) or the other copper(lI) ion assumes a square-pyramidal coordination geometry with two phenoxo-oxygen atoms, two nitrogen atoms of bpy, and one amido oxygen atom. The magnetic susceptibility of 4 was reproduced by an equation derived from the H = - 2J(S-1.S-2 +S-3.S-4) - 2J'(S-2.S-3 +S-4.S-1) Spin Hamiltonian with J = - 14.6 cm(-1) and J' = -4.0 cm(-1).

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  • Synthesis, magnetic properties, and incomplete double-cubane structure of Manganese(III)-metal(II) complexes [Mn(MeOH)L(OH)M(bpy)](2) (M = Zn, Cu, Ni, and Mn; H4L = 1,2-bis(2-hydroxybenzamido)benzene; bpy = 2,2 '-bipyridine) 査読

    Y Sunatsuki, H Shimada, T Matsuo, M Nakamura, F Kai, N Matsumoto, N Re

    INORGANIC CHEMISTRY   37 ( 21 )   5566 - 5574   1998年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    The manganese(III) complex K[MnL(py)(2)]. py (H4L = 1,2-bis(2-hydroxybenzamido)benzene, py = pyridine) reacted as a ligand complex at the two phenoxo oxygen atoms with metal(II) ion and 2,2'-bipyridine to give a series of heterometal complexes [Mn(MeOH)L(OH)M(bpy)](2) (M(II)= Zn (1); Cu (2); Ni (3); Mn(4)). X-ray structures were determined 1, C68H74N8O18Mn2Zn2: a = 12.367(3) Angstrom, b = 12.844(2) Angstrom, c = 12.262(2) Angstrom, alpha = 106.58(1)degrees, beta = 117.89(1)degrees, gamma =78.57(2)degrees, triclinic, P (1) over bar, and Z = 1. 2, C68W74N8O18Mn2Cu2: a = 13.447(1) Angstrom, b = 12.670(2) Angstrom, c = 21.732(1) Angstrom, beta = 107.076(5)degrees, monoclinic, P2(1)/n, and Z = 2. 3, C68H74N8O18Mn2Ni2: a = 12.358(3) Angstrom, b = 12.847(3) Angstrom, c = 12.315(3) Angstrom, alpha = 106.63(2)degrees, beta = 118.71(1)degrees, gamma = 78.32(2)degrees, triclinic, P (1) over bar, and Z = 1. 4, C66H66N8O16Mn4: a = 12.511(2) Angstrom, b = 21.129(3) Angstrom, c = 12.811(1) Angstrom, beta = 110.12(1)degrees, monoclinic, P2(1)/n, and Z = 2. The X-ray analyses confirmed that each of the crystals consists of an incomplete double-cubane molecule with a [Mn2M2O6] core, in which two M(II) ions are bridged by two hydroxo groups to form, a planar dinuclear moiety bridged by di-mu-hydroxo groups [(bpy)M(OH)(2)M(bpy)](2+) and the dinuclear moiety is sandwiched between two Mn(III) complexes [Mn(MeOH)L](-). The Mn(III) ion and the dinuclear M(II) moiety are triply bridged by the one hydroxo oxygen of the dinuclear moiety and two phenoxo oxygen atoms of the Mn(III) ligand complex. The two phenoxo oxygen atoms of the Mn(III) ligand complex coordinate as an axial ligand to two independent metal(II) ions of the dinuclear moiety. The magnetic susceptibilities of 1-4 were measured in the temperature range of 2-300 K. All the Mn(III) ions in these complexes are in a high-spin state of S-Mn = 2 with a d(4) electronic configuration, and the metal(II) ions are in the spin stares of S-Zn = 0, S-Cu = 1/2, S-Ni = 1, and S-Mn(II) = 1/2 (low-spin).
    The magnetic susceptibility data are well reproduced by the following spin Hamiltonian based on the rhombus spin coupling model with spin (S-1, S-2, S-3, S-4) = (2, S-M, 2, S-M), including a zero-field splitting term for the Mn(III) centers: H = g(Mn)beta(S-1 + S-3). H + g(M)beta(S-2 + S-4). H - 2J(S-1. S-2 + S-2. S-3 + S-3. S-4 + S-4. S-1) - 2J'(S-2. S-4) + D-Mn[S-1z(2) + S-3z(2)], in which g(Mn) and g(M) are the g factors of the Mn(III) and M(II) ions, J and J' are the Mn(III)-M(II) and M(II)-M(II) Heisenberg coupling constants, and D is the zero-field splitting parameter of Mn(III). The calculated best-fit parameters are as follows: g(Mn) = 1.91, g(Cu) = 2.39, J = -4.5 cm(-1), J' = -8.1 cm(-1), and D-Mn = -4.9 cm(-1) for 2; g(Mn) = 1.97, g(Ni) = 2.23, J = -1.5 cm(-1), J' = -2.6 cm(-1), and D-Mn = -5.5 cm(-1) for 3; and g(Mn) = 1.95, g(Mn(II)) = 2.29, J = -3.5 cm(-1), J' = -14.1 cm(-1), and D-Mn = -12.0 cm(-1) for 4. The spin frustration due to the incomplete double-cubane structure is discussed.

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  • Multi-dimensional structures constructed by the electrostatic interaction of potassium salts of cobalt(III) and manganese(III) complexes with 1,2-bis(2-hydroxybenzamido)benzene 査読

    Y Sunatsuki, M Mimura, H Shimada, F Kai, N Matsumoto

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   71 ( 1 )   167 - 173   1998年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

    Potassium salts of cobalt(III) and manganese(III) complexes, K[CoL(py)(2)].2EtOH.MeOH 1 and K[MnL(py)(2)].py 2, have been prepared, where H4L = 1,2-bis(hydroxybenzamido)benzene and py = pyridine. 1 crystallizes in the monoclinic space group P2(1)/n with the cell dimensions of a = 12.688(3), b = 17.555(4), c = 16.673(3) Angstrom, beta = 102.59(2)degrees, V = 3624(1) Angstrom(3), and Z = 4, in which potassium ion plays a role of connector for two adjacent [CoL(py)(2)](-) molecules through K-O interaction (two phenoxo oxygen atoms of a cobalt(III) complex, two oxygen atoms of the solvent molecules, and an amido oxygen of the adjacent unit) to give an extended one-dimensional structure. 2 crystallizes in the orthorhombic space group P2(1)2(1)2(1) with the cell dimensions of a = 14.358(1), b = 16.457(2), c = 13.703(2) Angstrom, V = 3237.7(5) Angstrom(3), and Z=4, in which potassium ion plays a role of connector for three adjacent [MnL(py)(2)](-) molecules through K-O interaction to give an extended three-dimensional structure.

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  • Synthesis, crystal structures and electrochemical properties of Cu-II and Ni-II complexes with hexadentate ligands containing thioether-amidopyridyl donor set 査読

    Y Sunatsuki, T Matsumoto, Y Fukushima, M Mimura, M Hirohata, N Matsumoto, F Kai

    POLYHEDRON   17 ( 11-12 )   1943 - 1952   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Novel two acyclic hexadentate ligands, 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,4-dithiobutane (H(2)bpctb) and 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,5-dithiopentane (H(2)bpctp), containing thioether functions were synthesized and their copper(II) and nickel(II) complexes [(Cu(bpctb)], 1: [Cu(bpctp)], 2; [Ni(bpctb)], 3 and [Ni(bpctp)], 4) were prepared. The structures of 1-4 were determined by X-ray crystallography. The coordination geometries of 3 and 4 are octahedral with two amido and two pyridyl nitrogen atoms and two thioether sulfur atoms of hexadentate ligand. However, the coordination geometry of 2 is a flattened tetrahedron combining two amido nitrogen atoms and two pyridyl nitrogen atoms of hexadentate ligand without thioether coordination. X-ray crystallography and ESR spectroscopic studies revealed that the coordination geometry of 1 is an uncommon equatorially elongated octahedron in solid state. However, this coordination geometry changes to an axially elongated one in solution. The copper(II/I) redox processes for 1 and 2 are around -1.2 V and the nickel(II/III) processes for 3 and 4 at around 0.3 V vs ferrocene/ferrocenium couple were observed in DMSO. (C) 1998 Elsevier Science Ltd. All rights reserved.

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  • Dinaionic ligand complexes, K-2[CuLn] and K-2[NiLn] (n=1,2; H4L1=1,2-bis(2-hydroxybenzamido)ethane, H4L2=1,2-bis(2-hydroxybenzamido)benzene), and their dinuclear Cu(II)-Cu(II) and Ni(II)-Cu(II) complexes 査読

    Y Sunatsuki, M Nakamura, N Matsumoto, F Kai

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   70 ( 8 )   1851 - 1858   1997年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

    Copper(II) and nickel(II) complexes with tetraanionic quadridentate ligands, K-2[CuLn] and K-2[NiLn] (n = 1, 2), have been prepared. We examined whether or not they can function as ''ligand complexes'', where H4L1 = 1,2-bis(2-hydroxy-benzamido)ethane and H4L2 = 1,2-bis(2-hydroxybenzamido)benzene. One of the ligand complexes, K-2[NiL1]. 2dmf . 2H(2)O, crystallizes in the monoclinic space group P2(1)ln with the cell dimensions of a = 15.34(8), b = 18.99(8), c = 18.86(5) Angstrom, beta = 100.2(3), V= 5406 Angstrom(3), and Z = 8. The ligand complex assumes a unique one-dimensional structure consisting of {[KO3][K(NiL1)O]}(n) as the repeating unit, where each K+ ion is surrounded octahedrally by six oxygen atoms with the distances of 2.672(2)-2.866(9) Angstrom and all the oxygen atoms act as bridging group to K+ ion. Each of the precursor complexes can function as an electrically dianionic bidentate ''ligand complex'' and reacts with Cu(II) ion and terminal capping ligand (cap) such as 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), ethylenediamine (en), and 1,3-diamino-propane (tn) to give di-mu-phenoxo-bridged dinuclear Cu(II)-Cu(II) and Ni(II)-Cu(II) complexes with the general formula of [(Cu or Ni)(LCu)-Cu-n(cap)]. The molar electrical conductivities of the dinuclear complexes measured in the DMF or DMSO solutions are essentially zero, indicating that the dinuclear structures are preserved in the solutions. The electrochemical measurements for a series of [(CuLCu)-Cu-2(cap)] (cap = bpy, phen, tn) demonstrated that the Cu(II/III) redox process of the (CuL2) site exhibits more positive potential (-0.04-0.09 V) than that of the mononuclear precursor complex (-0.288 V). One of the dinuclear complexes, [(CuLCu)-Cu-2(phen)(DMSO)], crystallizes in the orthorhombic space group Pna2(1) with the cell dimensions of a = 19.702(3), b = 15.847(3), c = 9.652(2) Angstrom, V = 3013 Angstrom(3), and Z=4. The complex consists of a discrete di-mu-phenoxo-bridged dinuclear structure, in which two copper(II) ions assume a square planar and square pyramidal coordination geometry and the bridging core of Cu2O2 is unequivalent, as found in the distances of Cu(1)-O(1)= 1.924(4) Angstrom, Cu(1)-O(2)= 1.908(4) Angstrom, Cu(2)-O(2)= 1.964(4) Angstrom and Cu(2)-O(1) =2.249(4) Angstrom. The magnetic susceptibility is well reproduced with the antiferromagnetic coupling parameter of J = -82 cm(-1) by the Bleaney-Boweres equation.

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  • Crystal structure and electrochemical properties of Cu-II complexes with 1,2-bis(2-hydroxybenzamido)benzene 査読

    Y Sunatsuki, R Hirata, Y Motoda, M Nakamura, N Matsumoto, F Kai

    POLYHEDRON   16 ( 23 )   4105 - 4111   1997年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The tetramethylammonium and potassium salts of [1,2-bis-(2-oxybenzamidato)benzene]copper(II) abbreviated as [NMe4](2)[Cu(hbab)] and K-2[Cu(hbab)] were prepared and characterized. The x-ray analysis of the potassium salt, K-2[Cu(hbab)] . 5DMF, revealed a unique one-dimensional chain structure consisting of {[KO3][K(Cu(hbab)O]}(n) as the resulting unit, where each K+ ion is surrounded octahedrally by six oxygen atoms and all the oxygen atoms play the role of a bridging group to the K+ ion. The tetramethylammonium. salt, [NMe4](2)[Cu(hbab)] . H2O, behaves as a 2:1 electrolyte in the 10(-3) mol dm(-3) solutions of methanol, acetonitrile and DMF, while the potassium salt behaves as a 2:1 electrolyte in methanol and as a 1:1 electrolyte in acetonitrile and DMF. The Cu-II/III redox potentials of the tetramethylammonium salt in DMF under the presence of 2 equivalent molar of K+, Na+, and Li+ shift to more positive values than those without alkali metal ions, where the magnitude of the positive shift increases with increasing of charge density of alkali metal ion, namely Li+ > Na+ > K+. The charge effect due to ion pair formation between [Cu(hbab)](2-) and Na+ or K+ causes the potential shift, while the potential shift in the case of the Lit ion is brought about by the decrease of donor ability of the phenolic oxygens, besides the charge effect. (C) 1997 Elsevier Science Ltd.

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  • Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety 査読

    Naohide Matsumoto, Masaaki Mimura, Yukinari Sunatsuki, Shingo Eguchi, Yukiko Mizuguchi, Hitoshi Miyasaka, Toshio Nakashima

    Bull. Chem. Soc. Jpn.   70   2461 - 2472   1997年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.70.2461

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MISC

  • Schiff Base Ligands Derived from l-Histidine Methyl Ester: Characterization, Racemization, and Dimerization of Their Transition-Metal Complexes

    Rina Ogawa, Yukinari Sunatsuki, Takayoshi Suzuki

    European Journal of Inorganic Chemistry   2018 ( 16 )   1733 - 1742   2018年4月

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    記述言語:英語   出版者・発行元:Wiley-VCH Verlag  

    Reactions of methyl (S)-2-[(2-hydroxybenzylidene)amino]-3-(1H-imidazol-4-yl)propanoate (S-H2LMe) and various transition-metal(II) salts (MX2: M = Mn, Fe, Co, and Ni
    X = ClO4, Cl, OAc, etc.) are examined. During the reactions with MnII and CoII salts, the MII ion is oxidized by air to form a cationic complex with two mono-deprotonated ligands, [MIII(S-HLMe)2]X [M, X = Mn, ClO4 (S-1ClO4)
    Co, ClO4 (S-3ClO4)
    and Co, Cl (S-3Cl)], where (S-HLMe)– is coordinated to a MIII center in a tridentate κ3O,N,N′ mode with a mer configuration. In contrast, the NiII ion is not oxidized
    only one of the ligands is deprotonated to form a similar monocationic complex, [NiII(S-HLMe)(S-H2LMe)]PF6 (S-6PF6), which forms a dimer structure by double hydrogen bonds between the coordinating phenoxide and phenol groups in the crystal. Interestingly, the above complexes show slow racemization of the ligand, as confirmed by circular dichroism spectroscopy. Racemic NiII complexes of [Ni(HLMe)(H2LMe)](PF6 or Cl) (rac-6PF6 or rac-6Cl) are isolated and their crystal structures are confirmed by X-ray diffraction analysis. In the case where Co(OAc)2 is used as the metal(II) salt, a new ligand dimerization reaction takes place to afford a complex of [Co(H2LLMe)]Cl (7Cl, H4LLMe = methyl (E)-3-{[3-(1H-imidazol-4-yl)-1-methoxy-1-oxopropano-2-yl]amino}-2-[(1H-imidazol-4-yl)methyl]-2-[(2-hydroxybenzylidene)amino]-3-(2-hydroxyphenyl)propanoate).

    DOI: 10.1002/ejic.201800137

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  • Polymorphs of spin-crossover iron(II) complex fac-[FeII(HLn -Pr)3]Cl・PF6 (HLn -Pr = 2-methylimidazol-4-yl-methylideneamino-n-propyl)

    Takahiro Ueno, Yuto Ii, Takeshi Fujinami, Naohide Matsumoto, Seiichiro Iijima, Yukinari Sunatsuki

    Polyhedron, Journal of Inorganic and Nuclear Chemistry   136 ( 1 )   13 - 22   2017年11月

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  • Circular and Chainlike Copper(II)–Lanthanide(III) Complexes Generated by Assembly Reactions of Racemic and Chiral Copper(II) Cross-Linking Ligand Complexes with LnIII(NO3)3·6H2O (LnIII = Gd<SUP>III・・・

    T. Ueno, T. Fujinami, N. Matsumoto, M. Furusawa, R. Irie, N. Re, T. Kanetomo, T. Ishida, Y. Sunatsuki

    Inorganic Chemistry   56 ( 3 )   1679 - 1695   2017年2月

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    記述言語:英語  

    Circular and Chainlike Copper(II)–Lanthanide(III) Complexes Generated by Assembly Reactions of Racemic and Chiral Copper(II) Cross-Linking Ligand Complexes with Ln&lt;SUP&gt;III&lt;/SUP&gt;(NO&lt;SUB&gt;3&lt;/SUB&gt;)&lt;SUB&gt;3&lt;/SUB&gt;·6H&lt;SUB&gt;2&lt;/SUB&gt;O (Ln&lt;SUP&gt;III&lt;/SUP&gt; = Gd&lt;SUP&gt;III&lt;/SUP&gt;, Tb&lt;SUP&gt;III&lt;/SUP&gt;, Dy&lt;SUP&gt;III&lt;/SUP&gt;)

    DOI: 10.1021/acs.inorgchem.6b02668

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  • Thyminato-bridged cyclic tetranuclear rhodium(III) complexes containing a sodium, calcium or lanthanoid ion as a template metal core

    Mika Sakate, Ayana Kashima, Haruka Hosoda, Yukinari Sunatsuki, Hiromi Ota, Akira Fuyuhiro, Takayoshi Suzuki

    INORGANICA CHIMICA ACTA   452   205 - 213   2016年10月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    Reactions of [(Cp*Rh)(2)(mu-OH)(3)]OH (Cp*=eta(5)-C5Me5-) and thymine (=H(2)thym) in methanol in the presence or absence of a certain metal salt were examined. From the reaction mixture without any template metal salt, a dinuclear hydroxido-bridged complex bearing monodentate monodeprotonated thyminato ligands,1[Cp*Rh(Hthym-kappa N-1))(2)(mu-OH)(2)], was isolated after recrystallization from water. In the presence of a metal salt MXn{=NaPF6, NaBF4, NaNO3, Ca(NO3)(2), Ca(ClO4)(2), La(NO3)(3), Eu(NO3)(3), Dy(NO3)(3) and Er (NO3)(3)) were deposited orange crystals (1P, 1B, 1N, 2N, 2C, 3N, 4N, 5N and 6N, respectively) which consist of a thyminato(2-)-bridged tetranuclear Cp*Rh complex incorporating a Mn+ cation, [(Cp*Rh)(4)(mu-thym)(4)M](n+). All complexes were characterized by the single-crystal X-ray diffraction method, which revealed that homochiral aggregations of four Rh-III centers were achieved to give metallacalix[4]arene-type clusters. It was also observed that the bridging modes of thyme(2-) ligands were dependent on the template metal ion. In the Na+-incorporated clusters (1X, X = P, B or N) a thyme(2-) ligand bridged two Rh-III and the third Na+ ions with a mu(3)-1 kappa N-1:2 kappa N-2(3),O-2:3 kappa O-2 mode, while in the Ln(3+) analogs (Ln = La, Eu, Dy or Er: 3N-6N) thyme(2-) exhibited a different bridging mode, mu(3)-1 kappa N-1:2 kappa N-2(3),O-4:3 kappa O-2. In the cases of Ca2+-incorporated clusters, the bridging mode is further dependent on the associated anion; only the mu(3)-1 kappa N-1:2 kappa N-2(3),O-2:3 kappa O-2-type cluster was obtained in the NO3- salt (2N), but the ClO4- salt (2C) afforded both types of the bridging clusters piled up alternatively in the crystals. The tetranuclear structures with a template metal cation, [(Cp*Rh)(4)(mu-thym)(4)M](n+), are maintained in solution. The magnetic behaviors of the Dy3+- and Er3+-incorporated complexes (5N and 6N) are also reported. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2016.01.023

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  • Preparation, structures and properties of manganese complexes containing amine-(amido or amidato)-phenolato type ligands

    Ryoji Mitsuhashi, Rina Ogawa, Ryuta Ishikawa, Takayoshi Suzuki, Yukinari Sunatsuki, Satoshi Kawata

    INORGANICA CHIMICA ACTA   447   113 - 120   2016年6月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    Complexation of 2-hydroxy-N-(n-aminoalkyl)benzamides, where n-aminoalkyl substituents are 2-amino-2-methylpropyl (H(2)L2(Me2)), (R)-2-aminopropyl {(R)-H(2)L2(Me)} and 3-aminopropyl (H(2)L3), with manganese(II)chloride or perchlorate were examined. With the 2-aminopropyl derivatives, dinuclear methoxido-bridged manganese(III) complexes bearing the dianionic ligands, [{Mn(L2(Me2) or (R)-L2(Me)) (MeOH)}(2)(mu-OMe)(2)] (2 or 4), were isolated and their crystal structures were determined. There was a weak antiferromagnetic interaction between two axially distorted Mn-III centers in 2. Also, with the ligand of (L2(Me2))(2) a mononuclear manganese(IV)complex, [Mn(L2(Me2))(2)]center dot DMF (3 center dot DMF) was obtained. In the crystal of 3 center dot DMF a heterochiral dimerization via the intermolecular double hydrogen-bonds was observed. In the case of reactions with H(2)L3, mononuclear manganese(III)complexes, [Mn(H(2)L3 ')(2)Cl-2] Cl (6)and [Mn(H(2)L3 ')(2)(MeOH)(2)]Cl-2(ClO4)(7), were afforded, where the ligand (H(2)L3 ')has a phenolateamide-ammonium type zwitterionic form of H(2)L3 and coordinates to a Mn-III center via the phenolato-O and amide-O atoms to form a six-membered chelate ring. Furthermore, a tetranuclear (Mn2Mn2III)-Mn-II double incomplete-cubane type cluster compound, [Mn-4(HL3)(2)Cl-2(OMe)(6)(MeOH)(2)]center dot 4MeOH (5a center dot 4MeOH) was revealed by the single-crystal X-ray diffraction study, although the bulk crystals (5)obtained from the reaction mixture showed a different PXRD pattern. The elemental analysis of the bulk crystals of 5 suggested that they consist of the same tetranuclear clusters. It is interesting that the bulk crystals of 5 were highly efflorescent, and it was suggested that their coordinated MeO and MeOH ligands were easily substituted by OH and H2O, respectively, in atmospheric air. This conversion changed their magnetic behaviors drastically. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2016.03.036

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  • Luminescent DyIII single ion magnets with same N6O3 donor atoms but different donor atom arrangements, ‘fac’-[DyIII(HLDL-ala)3]·8H2O and ‘mer’-[DyIII(HL<SUP>DL-phe</・・・

    D. Hamada, T. Fujinami, S. Yamauchi, N. Matsumoto, N. Mochida, T. Ishida, Y. Sunatsuki, M. Tsuchimoto, C. Coletti, N. Re

    Polyhedron   109   120 - 128   2016年4月

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    記述言語:英語  

    Luminescent DyIII single ion magnets with same N&lt;SUB&gt;6&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; donor atoms but different donor atom arrangements, ‘fac’-[Dy&lt;SUP&gt;III&lt;/SUP&gt;(HL&lt;SUP&gt;DL-ala&lt;/SUP&gt;)&lt;SUB&gt;3&lt;/SUB&gt;]·8H&lt;SUB&gt;2&lt;/SUB&gt;O and ‘mer’-[Dy&lt;SUP&gt;III&lt;/SUP&gt;(HL&lt;SUP&gt;DL-phe&lt;/SUP&gt;)&lt;SUB&gt;3&lt;/SUB&gt;]·7H&lt;SUB&gt;2&lt;/SUB&gt;O

    DOI: 10.1016/j.poly.2016.01.048

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  • Binuclear tetra-acetate bridged Gd(III) complex [Gd22-O2CMe)4(H2L)2](ClO4)2·2H2O·2MeOH (H2L = bis(5-methylimidazol-4-yl-methylideneaminoprop・・・

    M. Ito, D. Hamada, H. Ono, N. Matsumoto, Y. Sunatsuki, N. Re

    Inorganica Chimica Acta   443   274 - 278   2016年3月

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    記述言語:英語  

    Binuclear tetra-acetate bridged Gd(III) complex [Gd&lt;SUB&gt;2&lt;/SUB&gt;(μ&lt;SUB&gt;2&lt;/SUB&gt;-O&lt;SUB&gt;2&lt;/SUB&gt;CMe)&lt;SUB&gt;4&lt;/SUB&gt;(H&lt;SUB&gt;2&lt;/SUB&gt;L)&lt;SUB&gt;2&lt;/SUB&gt;](ClO&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;·2H&lt;SUB&gt;2&lt;/SUB&gt;O·2MeOH (H&lt;SUB&gt;2&lt;/SUB&gt;L = bis(5-methylimidazol-4-yl-methylideneaminopropyl)methylamine): Synthesis, structure, and magnetic properties

    DOI: 10.1016/j.ica.2015.12.029

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  • Synthesis, hydrogen-bonded 1D structure, and abrupt spin transition between high-spin (HS) and an ordered [H–HS–HS–LS] of a mononuclear iron(III) complex [FeIII(Him)2(4-MeOhapen)]CF3SO3 (Him = imidazole, 4-Me・・・

    Kyohei Miyano, Takahiro Nishida, Hiromasa Ono, Daisuke Hamada, Takeshi Fujinami, Naohide Matsumoto, Yukinari Sunatsuki

    Inorganica Chimica Acta   439   49 - 54   2016年1月

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    記述言語:英語  

    Synthesis, hydrogen-bonded 1D structure, and abrupt spin transition between high-spin (HS) and an ordered [H–HS–HS–LS] of a mononuclear iron(III) complex [Fe&lt;SUP&gt;III&lt;/SUP&gt;(Him)&lt;SUB&gt;2&lt;/SUB&gt;(4-MeOhapen)]CF&lt;SUB&gt;3&lt;/SUB&gt;SO&lt;SUB&gt;3&lt;/SUB&gt; (Him = imidazole, 4-MeOhapen = N,N’-bis(2-oxy-4-methoxyacetophenylidene)ethylenediamine)

    DOI: 10.1016/j.ica.2015.09.031

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  • Scan Rate Dependent Spin Crossover Iron(II) Complex with Two Different Relaxations and Thermal Hysteresis fac-​[FeII(HLn-​Pr)​3]​Cl·PF6 (HLn-​Pr = 2-​Methylimidazol-​4-​yl-​methylide・・・

    T. Fujinami, K. Nishi, D. Hamada, K. Murakami, N. Matsumoto, S. Iijima, M. Kojima, Y. Sunatsuki

    Inorganic Chemistry   54 ( 15 )   7291 - 7300   2015年8月

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    記述言語:英語  

    Scan Rate Dependent Spin Crossover Iron(II) Complex with Two Different Relaxations and Thermal Hysteresis fac-​[Fe&lt;SUP&gt;II&lt;/SUP&gt;(HL&lt;SUP&gt;n-​Pr&lt;/SUP&gt;)​&lt;SUB&gt;3&lt;/SUB&gt;]​Cl·PF&lt;SUB&gt;6&lt;/SUB&gt; (HL&lt;SUP&gt;n-​Pr&lt;/SUP&gt; = 2-​Methylimidazol-​4-​yl-​methylideneamino-​n-​propyl)

    DOI: 10.1021/acs.inorgchem.5b00701

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  • Syntheses, hydrogen-​bonded assembly structures, and spin crossover properties of [FeIII(Him)​2(n-​MeOhapen)​]​PF6 (Him = imidazole and n-​MeOhapen = N,​N'-​bis(n-​methoxy-​2-​oxyacetophenylidene)​ethylenediam・・・

    T. Fujinami, M. Ikeda, M. Koike, N. Matsumoto, T. Oishi, Y. Sunatsuki

    Inorganica Chimica Acta   432   89 - 95   2015年6月

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    記述言語:英語  

    Syntheses, hydrogen-​bonded assembly structures, and spin crossover properties of [Fe&lt;SUP&gt;III&lt;/SUP&gt;(Him)&lt;SUB&gt;​2&lt;/SUB&gt;(n-​MeOhapen)​]​PF&lt;SUB&gt;6&lt;/SUB&gt; (Him = imidazole and n-​MeOhapen = N,​N&#039;-​bis(n-​methoxy-​2-​oxyacetophenylidene)​ethylenediamine)​; n = 4, 5, 6)

    DOI: 10.1016/j.ica.2015.03.034

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  • Synthesis, structure, and spin equilibrium properties of [FeIIIX2L]​BPh4·solvents (X = 1-​methylimidazole and imidazole; L = N,N'-​bis(3-​ethoxycarbonylsalicylidene)​ethylenediamine)

    T. Fujinami, D. Hamada, N. Matsumoto, Y. Sunatsuki, R. Irie

    Inorganica Chimica Acta   430   239 - 244   2015年5月

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  • Hydrogen-​bonded 2D network structure and abrupt spin transition with thermal hysteresis of iron(III) complexes [FeIII(Him)​2(3-​MeOsalen)​]​·H2O·EtOH·X (Him = imidazole, 3-​MeOsalen = N,​N'-​bis(3-​methoxysal・・・

    K. Hanahara, H. Ono, T. Fujinami, N. Matsumoto, Y. Sunatsuki

    Inorganica Chimica Acta   429   93 - 98   2015年4月

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    記述言語:英語  

    Hydrogen-​bonded 2D network structure and abrupt spin transition with thermal hysteresis of iron(III) complexes [Fe&lt;SUP&gt;III&lt;/SUP&gt;(Him)​&lt;SUB&gt;2&lt;/SUB&gt;(3-​MeOsalen)​]​·H&lt;SUB&gt;2&lt;/SUB&gt;O·EtOH·X (Him = imidazole, 3-​MeOsalen = N,​N&#039;-​bis(3-​methoxysalicylidene)​ethylenediaminato, and X = PF&lt;SUB&gt;6&lt;/SUB&gt;&lt;SUP&gt;-&lt;/SUP&gt;​, AsF&lt;SUB&gt;6&lt;/SUB&gt;&lt;SUP&gt;-&lt;/SUP&gt;​, SbF&lt;SUB&gt;6&lt;/SUB&gt;&lt;SUP&gt;-&lt;/SUP&gt; (1-​3 respectively)​)

    DOI: 10.1016/j.ica.2015.01.047

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  • Oxidation and deprotonation of a ruthenium(II) complex with quinoline-​2-​carbaldehyde (pyridine-​2-​carbonyl)​hydrazone and formation of hydrazonato-​bridged heterodimetallic complexes

    A. Mori, T. Suzuki, Y. Sunatsuki, M. Kojima, K. Nakajima

    Bulletin of the Chemical Society of Japan   88 ( 3 )   480 - 489   2015年3月

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  • Thyminate(2-​)​-​bridged cyclic tetranuclear rhodium(III) complexes formed by a template of a sodium, calcium or lanthanoid ion

    Ayana Kashima, Mika Sakate, Hiromi Ota, Akira Fuyuhiro, Yukinari Sunatsuki, Takayoshi Suzuki

    Chemical Communications   51 ( 10 )   1889 - 1892   2015年

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  • Palladium(II) mononuclear and palladium(II)​/ruthenium(II) heterodinuclear complexes containing 2-​quinolyl-​substituted (pyridine-​2-​carbonyl)​hydrazone

    A. Mori, T. Suzuki, Y. Nakatani, Y. Sunatsuki, M. Kojima, K. Nakajima

    Dalton Transactions   44 ( 36 )   15757 - 15760   2015年

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  • Abrupt Spin Transition and Chiral Hydrogen-Bonded One-Dimensional Structure of Iron(III) Complex [FeIII(Him)2(hapen)]SbF6 (Him = imidazole, H2hapen = N,N’-bis(2-hydroxyacetophenylidene)ethylenediamine)

    T. Ueno, K. Miyano, D. Hamada, H. Ono, T. Fujinami, N. Matsumoto, Y. Sunatsuki

    MagnetChemistry   1 ( 1 )   72 - 82   2015年

  • Crystal Field Splitting of the Ground State of Terbium(III) and Dysprosium(III) Complexes with a Triimidazolyl Tripod Ligand and an Acetate Determined by Magnetic Analysis and Luminescence

    Seira Shintoyo, Keishiro Murakami, Takeshi Fujinami, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Masayuki Watanabe, Masanobu Tsuchimoto, Jerzy Mrozinski, Cecilia Coletti, Nazzareno Re

    INORGANIC CHEMISTRY   53 ( 19 )   10359 - 10369   2014年10月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    Terbium(III) and dysprosium(III) complexes with a tripodal N-7 ligand containing three imidazoles (H3L) and a bidentate acetate ion (OAc-), [Ln(III)(H3L)(OAc)](ClO4)(2)center dot MeOH center dot H2O (Ln = Tb, 1; Ln = Dy, 2), were synthesized and studied, where H3L = tris[2-(((imidazol-4-yl)methylidene)amino)ethyl]amine. The Tb-III and Dy-III complexes have an isomorphous structure, and each Tb-III or Dy-III ion is coordinated by the tripodal N-7 and the bidentate acetate ligands, resulting in a nonacoordinated capped-square-antiprismatic geometry. The magnetic data, including temperature dependence of the magnetic susceptibilities and field dependence of the magnetization, were analyzed by a spin Hamiltonian, including the crystal field effect on the Tb-III ion (4f(8), J = 6, S = 3, L = 3, g(J) = 3/2, F-7(6)) and the Dy-III ion (4f(9),J = 15/2, S = 5/2, L = 5, g(J) = 4/3, H-6(15/2)). The Stark splittings of the ground states F-7(6) of the Tb-III ion and H-6(15/2) of the Dy-III ion were evaluated from the magnetic analyses, and the energy diagram patterns indicated an easy axis (Ising type) anisotropy for both complexes, which is more pronounced for 2. The solid-state emission spectra of both complexes displayed sharp bands corresponding to the f-f transitions, and the fine structures assignable to the D-5(4) -&gt; F-7(6) transition for 1 and the F-6(9/2) -&gt; H-6(15/2) transition for 2 were related to the energy diagram patterns from the magnetic analyses. 1 and 2 showed an out-of-phase signal with frequency dependence in alternating current (ac) susceptibility under a dc bias field of 1000 Oe, indicative of a field-induced SIM.

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  • Chiral Crystal Structure of a P2(1)2(1)2(1) Kryptoracemate Iron(II) Complex with an Unsymmetric Azine Ligand and the Observation of Chiral Single Crystal Circular Dichroism

    Yukinari Sunatsuki, Kunihiro Fujita, Hisashi Maruyama, Takayoshi Suzuki, Hiroyuki Ishida, Masaaki Kojima, Robert Glaser

    CRYSTAL GROWTH & DESIGN   14 ( 8 )   3692 - 3695   2014年8月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    A chiral complex, [Fe(HL)(2)](PF6)(2) (1), where HL denotes 2-pyridylmethylidenehydrazono-4-(2-methylimidazoly)methane, was prepared. X-ray structure analysis revealed that it crystallizes as a kryptoracemate of sesquihydrate chiral crystals in the orthorhombic non-centrosymmetric space group P2(1)2(1)2(1) (Z = 8, Z' = 2). Two diastereomeric cationic complexes with opposite configuration reside within the asymmetric unit. KBr pellets prepared using selected single crystals showed enantiomorphous circular dichroism patterns.

    DOI: 10.1021/cg500635q

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  • Synthesis, Structure, Luminescence, and Magnetic Properties of a Single-​Ion Magnet "mer"-​[Tris(N-​[(imidazol-​4-​yl)​-​methylidene]​-​DL-​phenylalaninato)​]​terbium(III) and Related "fac"-​DL-​Alaninato Derivative

    Suguru Yamauchi, Takeshi Fujinami, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Masayuki Watanabe, Masanobu Tsuchimoto, Cecilia Coletti, Nazzareno Re

    Inorganic Chemistry   53 ( 12 )   5961 - 5971   2014年6月

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  • Chiral incomplete-​cubane type MnIII3O4 clusters containing a μ3-​methoxido or hydroxido

    Marina Inoue, Takayoshi Suzuki, Yukinari Sunatsuki, Akira Fuyuhiro, Nazzareno Re

    Chemistry Letters   43 ( 6 )   784 - 786   2014年6月

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  • Synthesis, structure, and magnetic property of a new mononuclear iron(II) spin crossover complex with a tripodal ligand containing three 1,​2,​3-​triazole groups

    Hiroaki Hagiwara, Ryo Minoura, Shohei Okada, Yukinari Sunatsuki

    Chemistry Letters   43 ( 6 )   950 - 952   2014年6月

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  • Abrupt Spin Transition with Thermal Hysteresis of Iron(III) Complex [FeIII(Him)​2(hapen)​]​AsF6 (Him = Imidazole, H2hapen = N,​N'-​Bis(2-​hydroxyacetophenylidene)​ethylenediamine)

    Takeshi Fujinami, Masataka Koike, Naohide Matsumoto, Yukinari Sunatsuki, Atsushi Okazawa, Norimichi Kojima

    Inorganic Chemistry   53 ( 4 )   2254 - 2259   2014年2月

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  • Linkage and Geometrical Isomers of Dichloridobis(triphenylphosphine)​ruthenium(II) Complexes with Quinoline-​2-​carbaldehyde (Pyridine-​2-​carbonyl)​hydrazone: Their Molecular Structures and Electrochemical and Spectroscopic Properties

    Asami Mori, Takayoshi Suzuki, Yukinari Sunatsuki, Atsushi Kobayashi, Masako Kato, Masaaki Kojima, Kiyohiko Nakajima

    European Journal of Inorganic Chemistry   2014 ( 1 )   186 - 197   2014年1月

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  • Molecular structure and spectroscopic properties of [Co(Me2dtc)​2{(Ph2PO)​2BF2}​] (Me2dtc = N,​N-​dimethyldithiocarbamate)

    Kyohei Sakano, Syohei Yamaguchi, Takayoshi Suzuki, Yukinari Sunatsuki, Masaaki Kojima, Kazuo Kashiwabara

    Inorganica Chimica Acta   410   122 - 125   2014年1月

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  • Preparation, crystal structures, and spectroscopic properties of cobalt(III) complexes bearing 2,​4-​pentanedionate (acac-​) and 2-​cyanoethylphosphines: trans-​[Co(acac)​2{P(CH2CH2CN)​nPh3-​n}​]​BF4 (n = 1-​3)

    Keiko Kihara, Syohei Yamaguchi, Yasuo Kawahata, Masakazu Kita, Takayoshi Suzuki, Yukinari Sunatsuki, Masaaki Kojima, Kazuo Kashiwabara

    Polyhedron   67   111 - 114   2014年1月

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  • Synthesis, Structure, Luminescent, and Magnetic Properties of Carbonato-Bridged ZnII2LnIII2 Complexes [(mu4-CO3)2{ZnIILnLnIII(NO3)}・・・

    Kiyomi Ehama, Yusuke Ohmichi, Soichiro Sakamoto, Takeshi Fujinami, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Masanobu Tsuchimoto, Nazzareno Re

    Inorganic Chemistry   52 ( 21 )   12828 - 12841   2013年11月

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    記述言語:英語  

    Synthesis, Structure, Luminescent, and Magnetic Properties of Carbonato-Bridged Zn&lt;SUP&gt;II&lt;/SUP&gt;&lt;SUB&gt;2&lt;/SUB&gt;Ln&lt;SUP&gt;III&lt;/SUP&gt;&lt;SUB&gt;2&lt;/SUB&gt; Complexes [(mu&lt;SUB&gt;4&lt;/SUB&gt;-CO&lt;SUB&gt;3&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;{Zn&lt;SUP&gt;II&lt;/SUP&gt;L&lt;SUP&gt;n&lt;/SUP&gt;Ln&lt;SUP&gt;III&lt;/SUP&gt;(NO&lt;SUB&gt;3&lt;/SUB&gt;)}&lt;SUB&gt;2&lt;/SUB&gt;] (Ln&lt;SUP&gt;III&lt;/SUP&gt; = Gd&lt;SUP&gt;III&lt;/SUP&gt;, Tb&lt;SUP&gt;III&lt;/SUP&gt;, Dy&lt;SUP&gt;III&lt;/SUP&gt;; L&lt;SUP&gt;1&lt;/SUP&gt; = N,N&#039;-Bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L&lt;SUP&gt;2&lt;/SUP&gt; = N,N&#039;-Bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato)

    DOI: 10.1021/ic4022273

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  • Four-Electron Oxidative Dehydrogenation Induced by Proton-Coupled Electron Transfer in Ruthenium(III) Complex with 2-(1,4,5,6-Tetrahydropyrimidin-2-yl)phenolate

    Ryoji Mitsuhashi, Takayoshi Suzuki, Yukinari Sunatsuki

    INORGANIC CHEMISTRY   52 ( 17 )   10183 - 10190   2013年9月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    New rutheniurn(II or III) complexes with general formula [Ru(O-N)(bpy)(2)](n+) (O-N = unsymmetrical bidentate phenolate ligand; bpy = 2,2'-bipyridine) were synthesized, and their crystal structures and electrochemical properties were characterized. Ru-II complexes with, 2-(2-imidazolinyl)phenolate (Himn(-)) or 2-(1,4,5,6-tetrahydropyrimidin-2-yl)phenolate (Hthp(-)) could be deprotonated by addition of excess KO'Bu, although the deprotonated species were easily reprotonated by. exposure to air. Unlike these Run complexes, their Ru-III analogs showed interesting ligand oxidation reactions upon addition of bases. With Ru-III (Himn)(bpy)(2)](2+), two electron oxidation of Himn(-) and reduction of the Rum center resulted in conversion of the 2-irnidazolinyl group, to a 2-imidazolyl group. On the other hand, the corresponding Hthp- complex exhibited four electron oxidation of the ligand to form 2-(2-pyrirnidyl)phenolate (pym-). These aromatization reactions of imidazolinyl and 1,4,5,6-tetrahydropyrimidyl groups were also achieved by the electrochemically generated Rum complexes.'

    DOI: 10.1021/ic401662v

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  • Carbonato-Bridged NiII2LnIII2 (LnIII = GdIII, TbIII, DyIII) Complexes Generated by Atmospheric CO2 Fixation and Their Single-Molecule-Magnet Behavior: [(・・・

    Soichiro Sakamoto, Takeshi Fujinami, Koshiro Nishi, Naohide Matsumoto, Naotaka Mochida, Takayuki Ishida, Yukinari Sunatsuki, Nazzareno Re

    Inorganic Chemistry   52 ( 12 )   7218 - 7229   2013年6月

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    記述言語:英語  

    Carbonato-Bridged Ni&lt;SUP&gt;II&lt;/SUP&gt;&lt;SUB&gt;2&lt;/SUB&gt;Ln&lt;SUP&gt;III&lt;/SUP&gt;&lt;SUB&gt;2&lt;/SUB&gt; (Ln&lt;SUP&gt;III&lt;/SUP&gt; = Gd&lt;SUP&gt;III&lt;/SUP&gt;, Tb&lt;SUP&gt;III&lt;/SUP&gt;, Dy&lt;SUP&gt;III&lt;/SUP&gt;) Complexes Generated by Atmospheric CO&lt;SUB&gt;2&lt;/SUB&gt; Fixation and Their Single-Molecule-Magnet Behavior: [(μ&lt;SUB&gt;4&lt;/SUB&gt;‑CO&lt;SUB&gt;3&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;{Ni&lt;SUP&gt;II&lt;/SUP&gt;(3-MeOsaltn)(MeOH or H&lt;SUB&gt;2&lt;/SUB&gt;O)Ln&lt;SUP&gt;III&lt;/SUP&gt;(NO&lt;SUB&gt;3&lt;/SUB&gt;)}&lt;SUB&gt;2&lt;/SUB&gt;]•solvent [3-MeOsaltn = N,N′‑Bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato]

    DOI: 10.1021/ic4008312

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  • Syntheses, Structures, and Magnetic Properties of Acetato- and Diphenolato-Bridged 3d−4f Binuclear Complexes [M(3-MeOsaltn)(MeOH)x(ac)Ln(hfac)2] (M = ZnII, CuII, NiII, CoII; Ln = La<SUP>・・・

    M. Towatari, K. Nishi, T. Fujinami, N. Matsumoto, Y. Sunatsuki, M. Kojima, N. Mochida, T. Ishida, N. Re, J. Mroziński

    Inorganic Chemistry   52 ( 10 )   6160 - 6178   2013年5月

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    記述言語:英語  

    Syntheses, Structures, and Magnetic Properties of Acetato- and Diphenolato-Bridged 3d−4f Binuclear Complexes [M(3-MeOsaltn)(MeOH)&lt;SUB&gt;x&lt;/SUB&gt;(ac)Ln(hfac)&lt;SUB&gt;2&lt;/SUB&gt;] (M = Zn&lt;SUP&gt;II&lt;/SUP&gt;, Cu&lt;SUP&gt;II&lt;/SUP&gt;, Ni&lt;SUP&gt;II&lt;/SUP&gt;, Co&lt;SUP&gt;II&lt;/SUP&gt;; Ln = La&lt;SUP&gt;III&lt;/SUP&gt;, Gd&lt;SUP&gt;III&lt;/SUP&gt;, Tb&lt;SUP&gt;III&lt;/SUP&gt;, Dy&lt;SUP&gt;III&lt;/SUP&gt;; 3‑MeOsaltn = N,N′‑Bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato; ac = Acetato; hfac = Hexafluoroacetylacetonato; x = 0 or 1)

    DOI: 10.1021/ic400594u

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  • Syntheses, three types of hydrogen-bonded assembly structures, and magnetic properties of [FeIII(Him)2(hapen)]Y•solvent (Him = imidazole, hapen = N,Nʼ-bis(2-hydroxyacetophenylidene)ethylenediamine, Y = BPh4<SU・・・

    M. Koike, K. Murakami, T. Fujinami, K. Nishi, N. Matsumoto, Y. Sunatsuki

    Inorganica Chimica Acta   399   185 - 192   2013年4月

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    記述言語:英語  

    Syntheses, three types of hydrogen-bonded assembly structures, and magnetic properties of [Fe&lt;SUP&gt;III&lt;/SUP&gt;(Him)&lt;SUB&gt;2&lt;/SUB&gt;(hapen)]Y•solvent (Him = imidazole, hapen = N,Nʼ-bis(2-hydroxyacetophenylidene)ethylenediamine, Y = BPh&lt;SUB&gt;4&lt;/SUB&gt;&lt;SUP&gt;–&lt;/SUP&gt;, CF&lt;SUB&gt;3&lt;/SUB&gt;SO&lt;SUB&gt;3&lt;/SUB&gt;&lt;SUP&gt;–&lt;/SUP&gt;, PF&lt;SUB&gt;6&lt;/SUB&gt;&lt;SUP&gt;–&lt;/SUP&gt;, ClO&lt;SUB&gt;4&lt;/SUB&gt;&lt;SUP&gt;–&lt;/SUP&gt;, and BF&lt;SUB&gt;4&lt;/SUB&gt;&lt;SUP&gt;–&lt;/SUP&gt;)

    DOI: 10.1016/j.ica.2013.01.021

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  • Hydrogen-bonding interactions, geometrical selectivity and spectroscopic properties of cobalt(III) complexes with unsymmetrical tridentate amine-amidato-phenolato type ligands

    Ryoji Mitsuhashi, Takayoshi Suzuki, Yukinari Sunatsuki, Masaaki Kojima

    Inorganica Chimica Acta   399   131 - 137   2013年4月

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    記述言語:英語  

    Four cobalt(III) complexes with the formula of [Co(Ln)2] - bearing tridentate amine-amidato-phenolato-type ligands (Ln: n = 1-4) were synthesized. All of the complexes were characterized by 1H NMR spectroscopy and X-ray analysis. The geometrical selectivity was found to depend on the flexibility of the amine-amidato chelate in combination with the planar 2-oxybenzamido 6-membered chelate
    that is, the amine-amidato 5-membered chelate took the mer-type geometry, and the 6-membered chelate took the fac-type geometry. In most of the mer-type complexes, intermolecular double hydrogen bonds via amidato(O) and amino group were selectively formed between their enantiomeric pairs of mononuclear complexes. In the case of two chiral ligands {L22- = 2-amino-1-(2-oxybenzamido)propane
    L32- = trans-1-amino-2-(2-oxybenzamido)cyclohexane}, [Co(L3)2]- showed diastereoselectivity while [Co(L2)2]- did not. Furthermore, PPh4[Co(L1)2] (L12- = 2-amino-1-(2-oxybenzamido)-2-methylpropane) showed an apparent solvatochromic behavior in several solvents. Although the molecular structures of [Co(L2 or L3)2]- are quite similar to that of [Co(L1) 2]-, these complexes did not exhibit such a solvatochromic behavior. © 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2013.01.011

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  • Facial and meridional geometrical isomers of tris(2-methylimidazol-4-yl-methylideneaminobenzyl)iron(II) with Delta- and Lambda-con figurations and their enantio-discriminative assembly via imidazole ... chloride hydrogen bonding and spin cross-over properties (Reprinted from Polyhedron, vol 44, pg 194, 2012)

    Daisuke Furushou, Tomotaka Hashibe, Takeshi Fujinami, Koshiro Nishi, Hiroaki Hagiwara, Naohide Matsumoto, Yukinari Sunatsuki, Masaaki Kojima, Seiichiro Iijima

    POLYHEDRON   52   1489 - 1498   2013年3月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    A bidentate 2-methylimidazol-4-yl-methylideneaminobenzyl ligand (HLMe-Renz) reacts with (FeCl2)-Cl-II center dot 4H(2)O and NaPF6 at a 3:1:1 molar ratio to yield a tris(2-methylimidazol-4-yl-methylideneaminobenzyl)iron(II) chloride hexafluorophosphate solvate with the formula of [Fe-II (HLMe-Benz)(3)]C1 center dot PF6 center dot solvent. Meridional and facial geometrical isomers, i.e., mer-[Fe-II (HLMe-Benz)(3)]C1 center dot PF6 center dot 1.5H(2)O (1 center dot PF6.1.5H(2)O) and fac[Fell( [Fe-II (HLMe-Benz)(3)]C1 center dot PF6 center dot EtOH.H2O (2-PF6 center dot EtOH center dot H2O), were selectively crystallized from methanol and ethanol solutions, respectively. fac-[Fe-II (HLMe-Benz)(3)]C1 center dot PF6 center dot H2O (2.SbF6 center dot 1.H2O) and fac-[Fe-II (HLMe-Benz)(3)]C1 center dot EtOH center dot H2O(2.ClO4 center dot EtOH2O) are synthesized in ethanol, using the corresponding anions. Each Fell ion has an octahedral coordination geometry with N6 donor atoms from three bidentate ligands. All three imidazole groups in both thefac- and mer-[Fe-II (HLMe-Benz)(3)](2+) cations are hydrogen-bonded to neighboring three Cl- ions, and each Cl- ion is hydrogen-bonded to three imidazole groups of three neighboring complex cations; this results in the formation of hydrogen-bonded assembly structures. mer-Complex 1.PF6.1.5H(2)O forms a heterochiral two-dimensional (2D) network structure comprised of cyclic [Fe-II (HLMe-Benz)(3)](2+) ... Cl-}(4) units with an Delta Delta Delta or Lambda Lambda Delta configuration; the PF6- ions occupy the spaces between the 2D layers. All the fac-complexes have isomorphous cubane-like tetrameric structures, i.e.,.Cl},. C114. The tetranuclear structure comprises four homo-chiral {fac-[Fe-II (HLMe-Benz)(3)](2+) ... Cl-3(-)} cations and four Cl- ions interconnected by twelve imidazole-chloride hydrogen bonds to form a chiral cubane supramolecule that encapsulates one counter anion. In the crystal lattice, the cubane-like tetramers with opposite chiralities are alternately arrayed. The temperature dependence of the magnetic susceptibilities and Mossbauer spectra reveal that the fac-complexes show incomplete spin crossover behavior, while the mer-complex shows a gradual spin crossover between high-spin (HS, S= 2) and low-spin (LS, S = 0) states. (C) 2013 Published by Elsevier Ltd.

    DOI: 10.1016/j.poly.2013.02.003

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  • Stepwise Spin Transition and Hysteresis of a Tetrameric Iron(II) Complex, fac-[Tris(2-methylimidazol-4-ylmethylidene-n-hexylamine)]iron(II) Chloride Hexafluorophosphate, Assembled by Imidazole•••Chloride Hydrogen Bonds

    Koshiro Nishi, Hiroki Kondo, Takeshi Fujinami, Naohide Matsumoto, Seiichiro Iijima, Malcolm A. Halcrow, Yukinari Sunatsuki, Masaaki Kojima

    European Journal of Inorganic Chemistry   2013 ( 5-6 )   927 - 933   2013年2月

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  • Influence of Intermolecular Hydrogen Bonding to Spin Crossover Property of Iron (III) Complexes with a N3O2 Pentadentate Ligand and a Monodentate Ligand

    Keishiro Murakami, Masataka Koike, Takeshi Fujinami, Naohide Matsumoto, Yukinari Sunatsuki

    Journal of Chemistry and Chemical Engineering   7 ( 4 )   285 - 291   2013年

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  • Comparison of ancillary ligand effects between 2,2’-bipyridine and 2-(2’-pyridyl)phenyl in the linkage and bridging isomerism of 5-methyltetrazolato iridium(III) and/or rhodium(III) complexes

    Asuka Takayama, Takayoshi Suzuki, Miyu Ikeda, Yukinari Sunatsuki, Masaaki Kojima

    Dalton Transactions   42 ( 40 )   14556 - 14567   2013年

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  • Carbonate-bridged tetranuclear (Ni2Gd2III)-Gd-II complex generated by atmospheric CO2 fixation

    Soichiro Sakamoto, Suguru Yamauchi, Hiroaki Hagiwara, Naohide Matsumoto, Yukinari Sunatsuki, Nazzareno Re

    INORGANIC CHEMISTRY COMMUNICATIONS   26 ( 1 )   20 - 23   2012年12月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    Atmospheric CO2 fixation by a basic reaction mixture of [Ni-II(3-MeOsaltn)(H2O)(2)] and Gd-III(NO3)(3)center dot 6H(2)O gave a carbonate-bridged tetranuclear (Ni2Gd2III)-Gd-II complex, (mu(4)-CO3)(2)[Ni-II(3-MeOsaltn)(MeOH)Gd-III(NO3)](2)center dot H2O, where 3-MeOsaltn denotes N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato. The tetranuclear structure possessing an inversion center can be described as two [(NiGdIII)-Gd-II] binuclear units bridged by two carbonate CO32- ions: two oxygen atoms of the carbonate ion bridge the high-spin Ni-II and Gd-III ions of a binuclear unit and the remaining oxygen atom of the carbonate ion coordinates to a Gd-III ion of the adjacent binuclear unit. The temperature-dependent magnetic susceptibilities, from 1.9 to 300 K, follow the Curie-Weiss equation of chi T-M= C/(T - theta) with theta = +2.3 K and C = 18.24 cm(3) K mol(-1), suggesting a ferromagnetic interaction. The magnetic data were well reproduced assuming two independent [Ni-II-Gd-III] binuclear units with the parameters of J(Ni-Gd) = +1.2 cm(-1) and D = +2.1 cm(-1). (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.inoche.2012.08.022

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  • Synthesis, structures, and magnetic properties of iron(II) complexes, [FeII(HLMe)2](ClO4)2 and its ethanol adduct [FeII(HLMe)2](ClO4)2•EtOH (H・・・

    Hiroaki Hagiwara, Suguru Yamauchi, Naohide Matsumoto, Yukinari Sunatsuki

    Polyhedron   48 ( 1 )   110 - 116   2012年11月

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    記述言語:英語  

    Synthesis, structures, and magnetic properties of iron(II) complexes, [Fe&lt;SUP&gt;II&lt;/SUP&gt;(HL&lt;SUP&gt;Me&lt;/SUP&gt;)&lt;SUB&gt;2&lt;/SUB&gt;](ClO&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt; and its ethanol adduct [Fe&lt;SUP&gt;II&lt;/SUP&gt;(HL&lt;SUP&gt;Me&lt;/SUP&gt;)&lt;SUB&gt;2&lt;/SUB&gt;](ClO&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;•EtOH (HL&lt;SUP&gt;Me&lt;/SUP&gt; = 2-methylimidazol-4-yl-methylideneamino-2-ethylpyridine): Their structural distortion and spin states

    DOI: 10.1016/j.poly.2012.09.010

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  • Preparation, Crystal Structures, and Behavior in Solution of Cobalt(III) Complexes Containing 2-Cyanoethylphosphines: trans-[Co(Me2dtc)2{P(CH2CH2CN)nPh3–n}]BF4 (n = 1–3; ・・・

    Keiko Kihara, Takayoshi Suzuki, Masakazu Kita, Yukinari Sunatsuki, Masaaki Kojima, Hideo D. Takagi

    Bulletin of the Chemical Sciety of Japan   85 ( 10 )   1160 - 1166   2012年10月

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    記述言語:英語  

    Preparation, Crystal Structures, and Behavior in Solution of Cobalt(III) Complexes Containing 2-Cyanoethylphosphines: trans-[Co(Me&lt;SUB&gt;2&lt;/SUB&gt;dtc)&lt;SUB&gt;2&lt;/SUB&gt;{P(CH&lt;SUB&gt;2&lt;/SUB&gt;CH&lt;SUB&gt;2&lt;/SUB&gt;CN)&lt;SUB&gt;n&lt;/SUB&gt;Ph&lt;SUB&gt;3–n&lt;/SUB&gt;}]BF&lt;SUB&gt;4&lt;/SUB&gt; (n = 1–3; Me&lt;SUB&gt;2&lt;/SUB&gt;dtc&lt;SUP&gt;–&lt;/SUP&gt;: N,N-Dimethyldithiocarbamate)

    DOI: 10.1246/bcsj.20120148

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  • Facial and meridional geometrical isomers of tris(2-methylimidazol-4-yl-methylideneaminobenzyl)- iron(II) with Δ- and Λ-configurations and their enantio-discriminative assembly via imidazole••• chloride hydrogen bonding and spin crossover properties

    Daisuke Furushou, Tomotaka Hashibe, Takeshi Fujinami, Koshiro Nishi, Hiroaki Hagiwara, Naohide Matsumoto, Yukinari Sunatsuki, Masaaki Kojima, Seiichiro Iijima

    Polyhedron   44 ( 1 )   194 - 203   2012年8月

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  • Enantioselective assembling into tetra- and octanuclear structures by deprotonation of copper(II) complexes of N-[(5-methylimidazol-4-yl)methylidene]-DL-phenylalanine and its L-form ligand

    Tomohiro Oishi, Tomotaka Hashibe, Saori Takahashi, Hiroaki Hagiwara, Naohide Matsumoto, Yukinari Sunatsuki

    POLYHEDRON   33 ( 1 )   209 - 217   2012年2月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Two copper(II) complexes with the protonated ligands [(CuCIHLDL)-C-II] and [(CuCIHLL)-C-II] were prepared, where HLDL, denotes N-[(5-methylimidazol-4-yl)methylidenel-DL-phenylalanine and HLL denotes its L-form ligand. The deprotonation of [(CuCIHLDL)-C-II] at the imidazole moiety gave an imidazolato-bridged cyclic tetranuclear arrayed [(CuLo)-L-II(H2O)] and [(CuLL)-L-II(H2O)] species, while the deprotonation of [(CuCIHLL)-C-II] gave an octanuclear structure [(Cu8L8L)-L-II center dot 4H(2)O] in which two cyclic tetranuclear species are linked by an intertetramer Cu-O (carboxylate) coordination bond. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.poly.2011.11.024

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  • Conglomerate crystallization, chiral recognition and spin-crossover in a host–guest complex consisting of FeIII complexes (host) and [Cr(ox)3]3− (guest)

    Yukinari Sunatsuki, Sho Miyahara, Yuu Sasaki, Takayoshi Suzuki, Masaaki Kojima, Naohide Matsumoto

    CrystEngComm   14 ( 20 )   6377 - 6380   2012年

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  • A Hydrogen Bond Motif Giving a Variety of Supramolecular Assembly Structures and Spin-Crossover Behaviors

    Koshiro Nishi, Naohide Matsumoto, Seiichiro Iijima, Malcolm A. Halcrow, Yukinari Sunatsuki, Masaaki Kojima

    INORGANIC CHEMISTRY   50 ( 22 )   11303 - 11305   2011年11月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    fA series of spin-crossover (SCO) iron(II) compounds, fac-[Fe-II(HLR)(3)]Cl center dot PF6 [R = methyl (Me, 1), ethyl (Et, 2), n-propyl (n-Pr, 3), n-butyl (n-Bu, 4), and n-pentyl (n-Pen, 5)] were synthesized, where HLR denotes a series of [(2-methylimidazol-4-yl)methylidene]-monoallcylamines. The cations fac-[Fe-II(HLR)(3)](2+) and chloride anions associate through 3:3 imidazole center dot center dot center dot chloride hydrogen bonding. This hydrogen-bonding motif gives rise to a variety of assembly structures consisting of a one-dimensional ladder for 3 and 4, two kinds of two-dimensional networks for 1 and 2, and a cubane-like structure for S. The compounds exhibit various types of SCO transitions between high-spin (S = 2) and low-spin (S = 0) states as a result of their intermolecular interactions.

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  • Chiral spin crossover iron(II) complex, fac-Lambda-[Fe(II)(HLR)3](ClO4)2•EtOH (HLR=2-methylimidazol-4-yl-methylideneamino-R-(+)-1-methylphenyl)

    Tomotaka Hashibe, Takeshi Fujinami, Daisuke Furusho, Naohide Matsumoto, Yukinari Sunatsuki

    INORGANICA CHIMICA ACTA   375 ( 1 )   338 - 342   2011年9月

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  • Geometric Selectivity, Hydrogen-Bonding Interaction, and Solvatochromism of Bis{N-(aminoalkyl)salicylamidato(2-)}cobaltate(III)

    Ryoji Mitsuhashi, Takayoshi Suzuki, Yukinari Sunatsuki, Masaaki Kojima

    CHEMISTRY LETTERS   40 ( 7 )   696 - 698   2011年7月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Cobalt(HI) complexes with N-(aminoalkyl)salicylamide dianions, Ln(2-) (n = 1-4), have been prepared and their molecular and crystal structures have been determined. The geometric (mer- or fac-) selectivity of [Co(Ln)(2)](-) complexes was dependent on the number of the amine-amidato chelate ring member. Intermolecular homochiral hydrogen-bonds and solvatochromic behavior of the complexes were also observed.

    DOI: 10.1246/cl.2011.696

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  • Synthesis, Characterization, and Chiral Assembly Structure of a Self-Complementary Iron(III) Complex, [FeIII(H2L5-Me)(HL5-Me)](ClO4)2•EtOH (H2L5-Me): N-[(5-Methylimidazol-4-yl)methylidene]histamine)

    Hiroaki Hagiwara, Koshiro Nishi, Naohide Matsumoto, Yukinari Sunatsuki, Masaaki Kojima, Seiichiro Iijima

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   84 ( 3 )   306 - 311   2011年3月

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  • Conformational effect of a spin crossover iron(II) complex: Bis[N-(2-methylimidazol-4-yl)methylidene-2-aminoethyl]propanediamineiron(II) perchlorate

    Hiroaki Hagiwara, Akitsugu Kawano, Takeshi Fujinami, Naohide Matsumoto, Yukinari Sunatsuki, Masaaki Kojima, Hiroshi Miyamae

    INORGANICA CHIMICA ACTA   367 ( 1 )   141 - 150   2011年2月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    A iron(II) complex of the linear hexadentate N(6) ligand H(2)L(2-3-2), [Fe(H(2)L(2-3-2))](ClO(4))(2), was synthesized and the spin crossover properties were investigated, where H(2)L(2-3-2) denotes bis[N-(2-methylimidazol-4-yl)methylidene-2-aminoethyl]propanediamine. The complex showed a gradual and reversible one-step spin crossover (SCO) between the high-spin (S = 2) and low-spin (S = 0) states at T(1/2) = 208 K without hysteresis. The crystal structures were determined at 296 and 250 K (HS state), 230, 210, and 200 K (intermediate between the HS and LS states) and 150 and 110 K (LS state). The spin transition from 296 to 150 K accompanies with the conformation change of the chelate rings at the triamine moiety and the formation of the hydrogen bond network in the same space group of orthorhombic Pbcn (no. 60). However, in the LS state at 110 K, the space group changed from orthorhombic Pbcn at 150 K (Pcan when the same axial setting to 110 K was used) to monoclinic P2(1)/a (no. 14) at 110 K, although no spin transition and no change of assembly structure between 150 and 110 K were observed. It give us an idea that the space group transformation is mainly related to the conformational thermodynamic stability of the chelate rings at the triamine moiety and is not directly correlated with the spin transition. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2010.12.016

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  • Assembly Structures and Spin Crossover Properties of Facial and Meridional Isomers of Tris[benzyl(2-methylimidazol-4-ylmethylidene)amine]iron(II) Chloride Hexafluorophosphate

    Daisuke Furusho, Koshiro Nishi, Tomotaka Hashibe, Takeshi Fujinami, Hiroaki Hagiwara, Naohide Matsumoto, Malcolm A. Halcrow, Seiichiro Iijima, Yukinari Sunatsuki, Masaaki Kojima

    CHEMISTRY LETTERS   40 ( 1 )   72 - 74   2011年1月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Facial- and meridional-isomers of tris[benzyl(2-methylimidazol-4-ylmethylidene)amine]iron(II) chloride hexafluorophosphate with the formulas of fac-[Fe(HLMe-Benz)(3)]Cl center dot PF6 center dot EtOH center dot H2O (1) and mer-[Fe(HLMe-Benz)(3)]Cl center dot PF6 center dot 1.5H(2)O (2) were selectively crystallized in ethanol and methanol, respectively. All three imidazole groups in both the fac- and mer-[Fe(HLMe-Benz)(3)](2+) cations are hydrogen-bonded to neighboring Cl- ions and give the assembly structures. The compounds differ, however, in that 1 has a discrete cubane-like tetranuclear cluster, while 2 forms a two-dimensional (2D) network structure. The magnetic susceptibilities data revealed that 1 and 2 are spin crossover complexes.

    DOI: 10.1246/cl.2011.72

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  • A single tripodal ligand stabilizing three different oxidation states (II, III, and IV) of manganese

    Yukinari Sunatsuki, Yukana Kishima, Tamami Kobayashi, Tomoka Yamaguchi, Takayoshi Suzuki, Masaaki Kojima, J. Krzystek, Markku R. Sundberg

    CHEMICAL COMMUNICATIONS   47 ( 32 )   9149 - 9151   2011年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    A series of mononuclear Mn-II, Mn-III, and Mn-IV complexes was prepared using a single tripodal ligand (H3L). Addition of a cation (NH4+, K+, Na+) to [(MnL)-L-III] showed a pronounced effect on the redox potentials. Different variants of Jahn-Teller distortion, axial elongation and compression, were observed in the Mn-III complexes.

    DOI: 10.1039/c1cc12418h

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  • 1D and 2D assembly structures by imidazole•••chloride hydrogen bonds of iron(II) complexes [FeII(HLn-Pr)3]Cl•Y (HLn-Pr = 2-methylimidazol-4-yl-methylideneamino-n-propyl; Y = AsF6, BF4) a・・・

    Takeshi Fujinami, Koshiro Nishi, Naohide Matsumoto, Seiichiro Iijima, Malcolm A. Halcrow, Yukinari Sunatsuki, Masaaki Kojima

    Dalton Transactions   40 ( 45 )   12301 - 12309   2011年

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    記述言語:英語  

    1D and 2D assembly structures by imidazole•••chloride hydrogen bonds of iron(II) complexes [Fe&lt;SUP&gt;II&lt;/SUP&gt;(HL&lt;SUP&gt;n-Pr&lt;/SUP&gt;)&lt;SUB&gt;3&lt;/SUB&gt;]Cl•Y (HL&lt;SUP&gt;n-Pr&lt;/SUP&gt; = 2-methylimidazol-4-yl-methylideneamino-n-propyl; Y = AsF&lt;SUB&gt;6&lt;/SUB&gt;, BF&lt;SUB&gt;4&lt;/SUB&gt;) and their spin states

    DOI: 10.1039/c1dt11063b

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  • 三脚型配位子を用いた新規金属錯体の結晶構造とさまざまな性質

    砂月幸成, 小島正明, 松本尚英

    日本結晶学会誌   53 ( 3 )   186 - 192   2011年

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  • Crystal Structures and Various Properties of Novel Metal Complexes with Tripodal Ligands

    Yukinari Sunatsuki, Masaaki Kojima, Naohide Matsumoto

    Journal of the Crystallographic Society of Japan   53 ( 3 )   186 - 192   2011年

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  • Face-Sharing Heterotrinuclear MII–LnIII–MII (M = Mn, Fe, Co, Zn; Ln = La, Gd, Tb, Dy) Complexes: Synthesis, Structures, and Magnetic Properties

    Tomoka Yamaguchi, Jean-Pierre Costes, Yukana Kishima, Masaaki Kojima, Yukinari Sunatsuki, Nicolas Brefuel, Jean-Pierre Tuchagues, Laure Vendier, Wolfgang Wernsdorfer

    Inorganic Chemistry   49 ( 20 )   9125 - 9135   2010年10月

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  • Structures and spin states of mono- and dinuclear iron(II) complexes of imidazole-4-carbaldehyde azine and its derivatives

    Yukinari Sunatsuki, Ryohei Kawamoto, Kunihiro Fujita, Hisashi Maruyama, Takayoshi Suzuki, Hiroyuki Ishida, Masaaki Kojima, Seiichiro Iijima, Naohide Matsumoto

    COORDINATION CHEMISTRY REVIEWS   254 ( 15-16 )   1871 - 1881   2010年8月

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    記述言語:英語   掲載種別:書評論文,書評,文献紹介等   出版者・発行元:ELSEVIER SCIENCE SA  

    Mononuclear [Fe(H(2)L(R))(2)]X(2) (R = H, 2-Me, 5-Me, 2-Et-5-Me; X = ClO(4), BF(4)) and dinuclear [Fe(2)(H(2)L(R))(3)]X(4) complexes containing imidazole-4-carbaldehyde azine (H2LH) and its derivatives prepared by condensation of 4-formylimidazole, 2-methyl- or 5-methyl-4-formylimidazole, or 2-ethy1-4-methy15-formylimidazole, with hydrazine in a 2:1 mole ratio in methanol, were prepared and their magnetostructural relationships were studied. In the mononuclear complexes, H(2)L(R) acts as an unsymmetrical tridentate ligand with two imidazole nitrogen atoms and one azine nitrogen atom, while in the dinuclear complexes, H(2)L(R) acts as a dinucleating ligand employing four nitrogen atoms to form a triple helicate structure. At room temperature, [Fe(2)(H(2)L(H))(3)](ClO(4))(4) and [Fe(2)(H(2)L(2)-me)(3)](ClO(4))(4) were in the high-spin (HS) and low-spin (LS) states, respectively. The results are in accordance with the ligand field strength of H(2)L(2-Me) with electron-donating methyl groups being stronger than H(2)L(H), with the order of the ligand field strengths being H(2)L(2-me) &gt; H(2)L(H). However, in the mononuclear [Fe(H(2)L(H))(2)](ClO(4))(2) and [Fe(H(2)L(2-Me))(2)](ClO(4))(2) complexes, a different order of ligand field strengths, H(2)L(H) &gt; H(2)L(2-Me), was observed because [Fe(H(2)O)(2)](ClO(4))(2) was in the LS state while Fe(H(2)L(2-me))(2)](ClO(4))(2) was in the HS state at room temperature. X-ray structural studies revealed that the interligand steric repulsion between a methyl group of an H(2)L(2-Me) ligand and the other ligand in Fe(H(2)L(2-Me))(2)](ClO(4))(2) is responsible for the observed change in the spin state. The same is true for [Fe(H(2)L(2-Et-5-Me))2](ClO(4))(2), while [Fe(H(2)L(5-Me))2](ClO(4))(2) does not involve such a steric congestion and stays in the LS state over the temperature range 5-300K. Two kinds of crystals (polymorphs) were isolated for [Fe(2)(H(2)L(H))(3)](BF(4))(4) and [Fe(2)(H(2)L(2-Et-5-Me))(3)](ClO(4))(4), and they exhibited different magnetic behaviors. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ccr.2009.11.016

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  • One-Dimensional Spin-Crossover Iron(II) Complexes Bridged by Intermolecular Imidazole-Pyridine NH center dot center dot center dot N Hydrogen Bonds, [Fe(HLMe)(3)]X-2 (HLMe = (2-Methylimidazol-4-yl-methylideneamino-2-ethylpyridine; X = PF6, ClO4, BF4)

    Koshiro Nishi, Shinobu Arata, Naohide Matsumoto, Seiichiro Iijima, Yukinari Sunatsuki, Hiroyuki Ishida, Masaaki Kojima

    INORGANIC CHEMISTRY   49 ( 4 )   1517 - 1523   2010年2月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    2-Methylimidazol-4-yl-methylideneamino-2-ethylpyddine (abbreviated as HLMe) is the 1:1 condensation product of 2-methyl-4-formylimidazole and 2-aminoethylpyridine and functions as a bidentate ligand to the iron(II) ion to produce the 3:1 complexes together with anions, [Fe(HLMe)(3)]X-2 (X = PF6 (1), ClO4 (2), BF4 (3)). The magnetic susceptibilities, differential scanning calorimetric measurements, and Mossbauer spectral measurements demonstrated that complexes 1, 2, and 3 showed a steep one-step spin crossover (SCO) between the high-spin (HS, S=2) and low-spin (LS, S = 0) states with small thermal hysteresis. Three complexes have an isomorphous structure and are crystallized in the same monoclinic space group, C2/c, both in the HS and LS states. The iron(II) ion has the octahedral coordination geometry of a facial isomer with N-6 donor atoms of three bidentate ligands, in which an imidazole and an imine nitrogen atom per ligand participate in the formation of the coordination bond, but the pyridine nitrogen is free from coordination. The complex cation fac-[Fe(HLMe)(3)](2+) is a chiral species with a Delta or Lambda isomer, and the adjacent Delta and Lambda isomers are linked alternately by an intermolecular imidazole-pyridine NH center dot center dot center dot N hydrogen bond to produce an achiral 1D chain. The two remaining imidazole moieties per complex are hydrogen-bonded to the anions that occupy the space among the chains. The SCO profile becomes steeper with the decrease of the anion size (73.0 angstrom(3) for PF6-, 54.4 angstrom(3) for ClO4-, and 53.4 angstrom(3) for BF4-). The SCO transition temperature T-1/2 of the PF6 (1), ClO4 (2), and BF4 (3) salts estimated from the magnetic susceptibility measurements are (T-down arrow = 151.8 K, T-up arrow = 155.3 K), (T-down arrow = 184.5 K, T-up arrow = 186.0 K), and (T-down arrow = 146.4 K, T-up arrow = 148.2 K), respectively, indicating that the T-1/2 value is not in accord with the anion size.

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  • Homochiral column structure of rac- and lamda-[MIII(tn)3]P3O9 (M = Co, Cr; tn = 1,3-diaminopropane; P3O9 = cyclotriphosphate(3–)) produced by multiple hydrogen bonds

    Yukinari Sunatsuki, Sho Miyahara, Takayoshi Suzuki, Masaaki Kojima, Toshio Nakashima, Naohide Matsumoto, Frode Galsbøl

    NEW JOURNAL OF CHEMISTRY   34 ( 12 )   2777 - 2784   2010年

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  • Mononuclear Bis(tridentate)-Type and Dinuclear Triple Helicate Iron(II) Complexes Containing 2-Ethyl-5-methylimidazole-4-carbaldehyde Azine

    Yukinari Sunatsuki, Hisashi Maruyama, Kunihiro Fujita, Takayoshi Suzuki, Masaaki Kojima, Naohide Matsumoto

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   82 ( 12 )   1497 - 1505   2009年12月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Mononuclear [Fe(H2L2-Et-5-Me)(2)](2+) and dinuclear [Fe-2(H2L2-Et-5-Me)(3)](4+) complexes, where H2L2-Et-5-Me denotes 2-ethyl-5-methylimidazole-4-carbaldehyde azine, were prepared and isolated as the perchlorate salts, and their structures and magnetic properties were studied. In file mononuclear complex, the ligand acts as ail unsymmetrical tridentate ligand with two imidazole nitrogen atoms and one azine nitrogen atom. The complex was in the HS state above 50 K. In the dinuclear complex, each ligand acts as a dinucleating ligand employing four nitrogen atoms to form a triple helicate structure. Two types of crystals, plates and blocks, were isolated for the dinuclear complex. The plate crystals exhibited a sharp spin transition, [LS-HS] &lt;-&gt; [HS-HS], with no [LS-LS] state being observed. The block crystals remained in the [HS-HS] state above 50 K.

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  • Structures and Spin States of Bis(tridentate)-Type Mononuclear and Triple Helicate Dinuclear lron(II) Complexes of Imidazole-4-carbaldehyde azine

    Yukinari Sunatsuki, Ryohei Kawamoto, Kunihiro Fujita, Hisashi Maruyama, Takayoshi Suzuki, Hiroyuki Ishida, Masaaki Kojima, Seiichiro Iijima, Naohide Matsumoto

    INORGANIC CHEMISTRY   48 ( 18 )   8784 - 8795   2009年9月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    Mononuclear [Fe(H(2)L(R))(2)](2+) and dinuclear [Fe(H(2)L(R))(3)](4+) (R = H, 2-Me, 5-Me) complexes containing the new imidazole-4-carbaldehyde azine ligand (H(2)L(H)) and its derivatives (H(2)L(2-Me) and H(2)L(5-Me)) prepared from the condensation reaction of 4-formylimidazole or 2-methyl- or 5-methyl-4-formylimidazole with hydrazine (2:1) were prepared, and their magnetostructural relationships were studied. In the mononuclear complexes, H(2)L(R) acts as an unsymmetrical tridentate ligand with two imidazole nitrogen atoms and one azine nitrogen atom, while in the dinuclear complexes, H(2)L(R) acts as a dinucleating ligand employing four nitrogen atoms to form a triple helicate. At room temperature, [Fe(2)(H(2)L(H))(3)](CIO(4))(4) and [Fe(2)(H(2)L(2-Me))(3)](CIO(4))(4) were in the high-spin (HS) and low-spin (LS) states, respectively. The results are in accordance with the ligand field strength of H(2)L(2-Me) with electron-donating methyl groups being stronger than H(2)L(H), with the order of the ligand field strengths being H(2)L(2-M) (e)&gt; H(2)L(H), However, in the mononuclearjFe(H(2)L(H))(2)](CIO(4))(2) and [Fe(H(2)L(2-Me))(2)](CIO(4))(2) complexes, a different order of Iigand field strengths, H(2)L(H) &gt; H(2)L(2-Me), was observed because [Fe(H(2)L(H))(2)] (CIO(4))(2) was in the LS state while [Fe(H(2)L(2-Me))(2)](CIO(4))(2) was in the HS state at room temperature. X-ray structural studies revealed that the interligand steric repulsion between a methyl group of an H(2)L(2-Me) ligand and the other ligand in [Fe(H(2)L(2-Me))(2)](CIO(4))(2) is responsible for the observed change in the spin state. Two kinds of crystals, needles and blocks, were isolated for [Fe2(H(2)L(H))(3)](BF(4))(4), and both exhibited a sharp spin transition, [LS-HS] &lt;-&gt; [HS-HS], The spin transition of the block crystals is more abrupt with a hysteresis, T(c)up arrow = 190 K and T(c)down arrow = 183 K with Delta T= 7 K.

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  • Synthesis and characterization of 8-quinolinolato vanadium(IV) complexes

    Kentaro Takano, Yukinari Sunatsuki, Masaaki Kojima, Isamu Kinoshita, Takashi Shibahara

    INORGANICA CHIMICA ACTA   362 ( 9 )   3201 - 3207   2009年7月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    Reaction of vanadium(III) chloride with 8-quinolinol (Hqn) gave a mononuclear vanadium(IV) complex, [VOCl(2)(H(2)O)(2)] 1) center dot 2H(2)qn center dot 2Cl center dot CH(3)CN, and three dinuclear vanadium(IV) complexes: [V(2)O(2)Cl(2) (qn)(2)(H(2)O)(2)] (2) center dot Hqn, [V(2)O(2)Cl(2)(qn)(2)(C(3)H(7)OH)(2)] (3), and [V(2)O(2)Cl(2)(qn)(2)(C(4)H(9)OH)(2)] (4). Reaction of vanadium(III) chloride with 5-chloro-8-quinolinol (HClqn) gave four dinuclear vanadium(IV) complexes: [V(2)O(2)Cl(2)(Clqn)(2)(H(2)O)(2)] (5) center dot 2HClqn, [V(2)O(2)Cl(2)(Clqn)(2)(C(3)H(7)OH)(2)] (6), [V(2)O(2)Cl(2)(Clqn)(2)(C(6)H(5)CH(2)OH)(2)] (7), and [V(2)O(2)Cl(2)(Clqn)(2)(C(4)H(9)OH)(2)] (8) center dot 2C(4)H(9)OH. Reaction of vanadium(III) chloride with 5-fluoro-8-quinolinol (HFqn) gave two dinuclear vanadium(IV) complexes: [V(2)O(2)Cl(2)(Fqn)(2)(H(2)O)(2)] (9) center dot HFqn center dot 2H(2)O and V(2)O(2)Cl(2)(Fqn)(2)(C(3)H(7)OH)(2)] (10). X-ray structures of 1 center dot 2H(2)qn center dot 2Cl center dot CH(3)CN, 3, 4, 6, 7, 8 center dot 2 t-BuOH, and 10 have been determined. As to the mononuclear species 1 center dot 2H2qn center dot 2Cl center dot CH(3)CN, coordination of Hqn to vanadium does not occur, but protonation to Hqn occurs to give H(2)qn(+), which links 1&apos;s through hydrogen bonding, while each of the dinuclear species has a terminal and a bridging qn (or Clqn, Fqn) ligand, giving rise to a (V-O)(2) ring. Magnetic measurements of 3, 4, 6, 7, and 10 in solid form show very weak antiferromagnetic behavior, and the effective magnetic moments are close to spin only value (2.44) of d(1)-d(1) system, while ESR of 3 in THF shows dissociation to monomeric species. Change from mononuclear, 1, to dinuclear, 2, species was followed by the change of electronic spectrum. (C) 2009 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.ica.2009.02.025

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  • Synthesis, structures, and magnetic properties of face-sharing heterodinuclear Ni(II)-Ln(III) (Ln = Eu, Gd, Tb, Dy) complexes

    Tomoka Yamaguchi, Yukinari Sunatsuki, Hiroyuki Ishida, Masaaki Kojima, Haruo Akashi, Nazzareno Re, Naohide Matsumoto, Andrzej Pochaba, Jerzy Mrozinski

    INORGANIC CHEMISTRY   47 ( 13 )   5736 - 5745   2008年7月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    Heterodinuclear [((NiL)-L-II)Ln(III)(hfac)(2)(EtOH)] (H3L = 1,1,1-tris[(salicylideneamino)methyl]ethane; Ln = Eu, Gd, Tb, and Dy; hfac = hexafluoroacetylacetonate) complexes (1 . Ln) were prepared by treating [Ni(H1.5L)]Cl-0.5 (1) with (Ln(hfaC)(3)(H2O)(2)] and triethylamine in ethanol (1:11). All 1 . Ln complexes (1 . Eu, 1 . Gd, 1 . Tb, and 1 . Dy) crystallized in the triclinic space group P (1) over bar (No. 2) with Z = 2 with very similar structures. Each complex is a face-sharing dinuclear molecule. The Ni-II ion is coordinated by the L3- ligand in a N3O3 coordination sphere, and the three phenolate oxygen atoms coordinate to an Ln(III) ion as bridging atoms. The Ln(III) ion is eight-coordinate, with four oxygen atoms of two hfac-'s, three phenolate oxygen atoms of L3-, and one ethanol oxygen atom coordinated. Temperature-dependent magnetic susceptibility and field-dependent magnetization measurements showed a ferromagnetic interaction between Ni-II and Gd-III in 1 . Gd. The Ni-II-Ln(III) magnetic interactions in 1 . Eu, 1 . Tb, and 1 . Dy were evaluated by comparing their magnetic susceptibilities with those of the isostructural Zn-II-Ln(III) complexes, [(ZnL)Ln(hfac)(2)(EtOH)] (2 . Ln) containing a diamagnetic Zn-II ion. A ferromagnetic interaction was indicated in 1 . Tb and 1 . Dy, while the interaction between Ni-II and Eu-III was negligible in 1 . Eu. The magnetic behaviors of 1 . Dy and 2 . Dy were analyzed theoretically to give insight into the sublevel structures of the Dy-III ion and its coupling with Ni-II. Frequency dependence in the ac susceptibility signals was observed in 1 . Dy.

    DOI: 10.1021/ic8000575

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  • Mono- and trinuclear Cu-II complexes with tripodal ligands

    Yukinari Sunatsuki, Tamami Kobayashi, Kenji Harada, Tomoka Yamaguchi, Matsuo Nonoyama, Masaaki Kojima

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   81 ( 6 )   716 - 725   2008年6月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Mononuclear [Cu(HL)] (1) and trinuclear [Cu-3(L)(2)] (3) complexes were synthesized, where H3L (1,1,1-tris[(salicylideneamino)methyl] ethane) is a tripodal ligand obtained by condensation of 1,1,1-tris(aminomethyl)ethane and salicylaldehyde in a 1:3 mole ratio. Another mononuclear complex [Cu(HL')] (2), where one of the three arms was disconnected probably due to thermal hydrolysis, was also obtained. The crystal structures, electronic spectra, and electrochemical and magnetic properties of the complexes were studied. In 1, one of the arms of H3L is not coordinated to the metal atom, and the ligand serves as a tetradentate N2O2 ligand, the complex assuming a slightly distorted square-planar structure. In the trinuclear complex, an imine nitrogen atom and a phenolate oxygen atom of one arm of each terminal unit coordinate to the central Cu-II ion to form a linear trinuclear complex. The coordination geometry about each Cu is square planar. All of the complexes involve pi-pi stacking interactions between the molecules in the crystal structures, which are responsible for weak magnetic interactions. An electrochemical study of 3 in DMSO showed that the central Cu-II is more easily reduced to Cu-I than the terminal Cu ions. The mononuclear complexes, 1 and 2, show a quasi-reversible Cu-II/I couple almost at the same position as that of the terminal Cu ions of 3.

    DOI: 10.1246/bcsj.81.716

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  • Synthesis, structures, and magnetic properties of doubly face-sharing heterotrinuclear Ni-II-Ln(III)-Ni-II (Ln = Eu, Gd, Tb, and Dy) complexes

    Tomoka Yamaguchi, Yukinari Sunatsuki, Hiroyuki Ishida, Masaaki Kojima, Haruo Akashi, Nazzareno Re, Naohide Matsmuoto, Andrzej Pochaba, Jerzy Mrozinski

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   81 ( 5 )   598 - 605   2008年5月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Heterotrinuclear [((NiL)-L-II)(2)Ln(III)(NO3)] complexes (where H3L = 1,1,1-tris[(salicylideneamino)methyl] ethane and Ln = Gd (1), Eu (2), Tb (3), and Dy (4)) were prepared by treating [Ni(H1.5L)]Cl-0.5 with Ln(NO3)(3)center dot 6H(2)O in the presence of triethylamine. Complexes 1 center dot 2CH(3)OH, 3 center dot 2CH(3)OH, and 4 center dot C2H5OH center dot 0.5H(2)O crystallized in the triclinic space group, P (1) over bar (No. 2), with Z = 2, while 2 center dot CH3OH center dot 0.5H(2)O crystallized in the tetragonal space group, I4(1)/a (No. 88), with Z = 8. All the complexes had very similar structures. Each complex was a doubly face-sharing trinuclear molecule. The Ni-II ion is coordinated by the L3- ligand in an N3O3 coordination sphere, and the three phenolate oxygen atoms coordinate to an Ln(III) ion as bridging atoms. The Ln(III) ion is eight coordinate with six phenolate oxygen atoms of the two L3- ligands and two oxygen atoms of NO3-. Coordination of the NO3- group entails a bending of the Ni center dot center dot center dot Ln center dot center dot center dot Ni angle (ca. 140 degrees). All the complexes involve pi-pi and CH-pi interactions between the neighboring molecules to form a three-dimensional structure. Temperature-dependent magnetic susceptibility and field-dependent magnetization measurements on 1 showed a ferromagnetic interaction between the Ni-II and Gd-III atoms. A ferromagnetic interaction was also suggested for Ni-II-Tb-III (3) and Ni-II-Dy-III (4).

    DOI: 10.1246/bcsj.81.598

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  • Mononuclear nickel(II) and zinc(II) complexes with deprotonated forms of the tripodal hexadentate ligand 1,3-bis(2-hydroxybenzylidene)-2-(2-hydroxybenzylideneaminomethyl)-2-methylpropane-1,3-diamine

    Tomoka Yamaguchi, Yukinari Sunatsuki, Hiroyuki Ishida

    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS   64 ( 4 )   M156 - M160   2008年4月

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    記述言語:英語   出版者・発行元:BLACKWELL PUBLISHING  

    DOI: 10.1107/S0108270108004289

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  • Cobalt(III) complexes of a tripodal ligand containing three imidazole groups: Properties and structures of racemic and optically active species

    Hirofumi Nakamura, Megumi Fujii, Yukinari Sunatsuki, Masaaki Kojima, Naohide Matsumoto

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   2008 ( 8 )   1258 - 1267   2008年3月

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    記述言語:英語   出版者・発行元:WILEY-V C H VERLAG GMBH  

    The complex [Co(H3L)](ClO4)(3)center dot H2O (1), where H3L (tris[2-(4-imidazoylmethylideneamino) ethyl] amine) is a tripodal ligand obtained by condensation of tris(2-aminoethyl)amine and 4-formylimidazole in a 1:3 molar ratio, was synthesized and optically resolved by fractional crystallization of the dia-stereomeric salt with [Sb-2{(R,R)-tart)(2)](2-) [(R,R)-tart = (2R,3R)-tartrate(4-) ion]. From the less soluble part, Lambda-[Co(H2L)][Sb-2- (R, R) -tart)(2)]center dot 4H(2)O (2) was isolated. Starting from 2, two optically active complexes, Lambda-[Co(H3L)]ClO4)(3)center dot 1.5H(2)O (Lambda-1) and Lambda-[Co(L)] (Lambda-3), were obtained. The crystal structures of these complexes are compared with those of the racemic structures. A-I shows an unusually strong circular dichroism (lambda = 488 nm, Delta epsilon = -7.74 M-1 cm(-1)) in the first d-d absorption band region. The effects of deprotonation-reprotonation of the uncoordinated imidazole NH groups of Lambda-[Co(H3L)](3+) on the UV/Vis and CD spectra and on the cyclic voltammograms were studied in methanol. Although the deprotonation-reprotonation reactions are reversible, the redox couple for the completely deprotonated species [CoIII/II(L)](0/-) is not observed. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).

    DOI: 10.1002/ejic.200700950

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  • Spin states of mono- and dinuclear iron(II) complexes with bis(imidazolylimine) ligands

    Kunihiro Fujita, Ryohei Kawamoto, Ryohei Tsubouchi, Yukinari Sunatsuki, Masaaki Kojima, Seiichiro Iijima, Naohide Matsumoto

    CHEMISTRY LETTERS   36 ( 10 )   1284 - 1285   2007年10月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Bis(imidazolylimine) ligands, H2L (H) and H-2(Me), were prepared from hydrazine and 4-formylimidazole or 2-methyl4-formylimidazole (1:2), respectively. Mononuclear iron(II) complexes, [Fe(H2LH)(2)](CIO4)(2)center dot MeOH and [Fe(H2LMe)(2)](CIO4)(2)center dot 2H(2)O, were in the LS and HS states, respectively, in the temperature range 5-300K. A triple-helicate [Fe-2(H2LMe)(3)](CIO4)(4), showed an abrupt [LS-HS] to [HS-HS] spin transition at 240K, while [Fe-2(H2LMe)(3)](CIO4)(4) remained in the LS state in the temperature range 5-300 K.

    DOI: 10.1246/cl.2007.1284

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  • Chiral recognition and conglomerate crystallization induced by self-organization of cobalt(III) complexes of a tripodal ligand containing three imidazole groups

    Hirofumi Nakamura, Yukinari Sunatsuki, Masaaki Kojima, Naohide Matsumoto

    INORGANIC CHEMISTRY   46 ( 20 )   8170 - 8181   2007年10月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    The effect of a counteranion on chiral recognition inducing conglomerate crystallization of a cobalt(III) complex is reported. An achiral tripodal ligand involving three imidazole groups, tris{[2-{(imidazol-4-yl)methylidene}amino]-ethyl}amine (H3L), was prepared by condensation of tris(2-aminoethyl)amine and 4-formylimidazole in a 1:3 mole ratio. The reaction of H3L and trans-[(CoCl2)-Cl-III(PY)(4)](+) afforded the chiral (Delta or Lambda) [Co-III(H3L](3+) complex. The formally hemideprotonated complexes [Co-III(H1.5L)]X-1.5 center dot nH(2)O (where X = Cl, Br, I, BF4, ClO4, or PF6) were synthesized by controlled deprotonation of the uncoordinated imidazole NH groups of [Co(H3L)](3+). In crystals of the hemideprotonated complex, two components, [Co(H3L)]3+ and [Co(L)], with the same absolute configuration are linked by imidazoleimidazolate hydrogen bonds to form an extended homochiral 2D sheet structure, which is composed of a hexanuclear unit with a trigonal void. There are two ways of stacking the sheets: One is via homochiral stacking, and the other is via heterochiral stacking. When the size of the counterion is small (i.e., X = Cl, Br, 1, or BF4), adjacent homochiral sheets with the same chirality are stacked to form a homochiral crystal (conglomerate). With large anions (i.e., ClO4- and PF6-), a homochiral sheet consisting of Delta enantiomers and a sheet consisting of Lambda enantiomers are stacked alternately to give a heterochiral crystal (a racemic crystal). Optically active Lambda-[Co(H1.5L)](ClO4)(1.5)-H2O was synthesized from Lambda-[Co(H3L)](3+), and the crystal structure was compared to that of the racemic complex. There are two conflicting factors governing the crystal structure: the skeletal density; the size of the channels. The 2D sheets are more closely packed in the homochiral crystal than in the heterochiral crystal. However, the channels, where the counterions are accommodated, are smaller in the homochiral crystal, and the steric congestion between the anions increases with increasing anion size. The heterochiral crystal has a flexible, zigzag channel structure, and the size of the channels can increase to accommodate larger anions. Thus, complexes with large anions (i.e., ClO4- and PF6-) preferentially form heterochiral crystals rather than homochiral crystals.

    DOI: 10.1021/ic070286+

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  • Synthesis and Structures of Vanadium–Cerium Trinuclear Complexes with Schiff-Base Ligands

    Masanobu Tsuchimoto, Toshio Ishii, Takane Imaoka, Kimihisa Yamamoto, Naoki Yoshioka, Yukinari Sunatsuki

    Bull. Chem. Soc. Jpn.   79 ( 9 )   1393 - 1397   2006年9月

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  • A ruthenium(II) complex with a tripodal ligand containing three imidazole groups

    Tomoka Yamaguchi, Kazutoshi Harada, Yukinari Sunatsuki, Masaaki Kojima, Kiyohiko Nakajima, Naohide Matsumoto

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   2006 ( 16 )   3236 - 3243   2006年8月

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    記述言語:英語   出版者・発行元:WILEY-V C H VERLAG GMBH  

    The orange [Ru-II(H3L)](ClO4)(2)center dot 3H(2)O (1) complex was synthesized from cis-[RuCl2(dmsO)(4)] and H3L, where H3L (tris{[2-{(imidazol-4-yl)methylidene}amino]ethyl}amine) is a tripodal ligand obtained by condensation of tris(2-aminoethyl)-amine and 4-formylimidazole in a 1:3 mol ratio. The X-ray crystal structure analysis revealed that the complex has an octahedral structure coordinated by three imidazole nitrogen atoms and three Schiff base (imine) nitrogen atoms. The uncoordinated NH groups of the imidazole moieties of 1 are easily deprotonated by the action of a base. The effect of deprotonation on the Ru-III/Ru-II redox potential was studied by cyclic voltammetry in methanol containing 0.1 M LiClO4. Complete deprotonation shifts the Ru-III/Ru-II potential to a much more negative value from -0.18 to -0.72 V vs. Ag/Ag+, making it easier to oxidize. The bluish-purple Ru-III complex, [Ru-III(H3L)](3+), was formed by controlled-potential electrolysis of 1, and the electronic spectrum is reported.

    DOI: 10.1002/ejic.200600111

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  • Ferro- and antiferromagnetic interactions in face-sharing trioctahedral (NiMnNiII)-Mn-II-Ni-II and (NiFeNiII)-Fe-II-Ni-III complexes with the same 1-5/2-1 spin system

    T Kobayashi, T Yamaguchi, H Ohta, Y Sunatsuki, M Kojima, N Re, N Matsuo, N Matsumoto

    CHEMICAL COMMUNICATIONS   2006 ( 18 )   1950 - 1952   2006年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    Two heterotrinuclear complexes, [Mn-II((NiL)-L-II)(2)]center dot 2CH(3)OH (where H3L=1,1,1-tris(N-salicylideneaminomethyl) ethane) and [Fe-III(Ni L-II)(2)]NO(3)center dot C2H5OH, consisting of three face-sharing octahedra have been prepared; although these complexes have closely related structures and have the same 1-5/2-1 spin system, they show completely different magnetic interactions between the adjacent metal ions: ferromagnetic (Ni-II-Mn-II) and antiferromagnetic (Ni-II-Fe-III).

    DOI: 10.1039/b517503h

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  • Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand

    S. Iijima, F. Mizutani, O. Niwa, N. Matsumoto, Y. Sunatsuki, M. Kojima

    Hyperfine Interactions   166 ( 1-4 )   397 - 402   2005年11月

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    The spin-crossover behaviors of mixed-valence iron compounds [Fe IIH3L][FeIIIL](NO3)2 (1) and [FeIIH3LMe][FeIIIL Me](NO3)2 (2) have been investigated by 57Fe Mössbauer spectroscopy, where H3L is a hexadentate N6 tripod ligand containing three imidazole groups and H3LMe is its 2-methylimidazole derivative. Deconvolution analyses of the Mössbauer spectra revealed that a two-step SCO (LS Fe II-LS FeIII→HS FeII-LS Fe III→HS FeII-HS FeIII) proceeds in each compound on elevating the temperature. Compound 2 exhibited lower spin-transition temperatures than 1. "Frozen-in effect" was observed below 120 and 50 K for 1 and 2, respectively. © 2006 Springer Science+Business Media, Inc.

    DOI: 10.1007/s10751-006-9299-0

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  • Supramolecular spin-crossover iron complexes based on imidazole-imidazolate hydrogen bonds

    Y Sunatsuki, H Ohta, M Kojima, Y Ikuta, Y Goto, N Matsumoto, S Iijima, H Akashi, S Kaizaki, F Dahan, JP Tuchagues

    INORGANIC CHEMISTRY   43 ( 14 )   4154 - 4171   2004年7月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    The [Fe-II(H3L)](BF4)(2).3H(2)O (1) complex was synthesized, where H3L (tris{[2-1{imidazole-4-yl)methylidene}amino]-ethyl}amine) is a tripodal ligand obtained by condensation of tris(2-aminoethyl)amine and 4-formylimidazole (fim) in a 1:3 molar ratio. Starting from 1, a series of complexes, [Fe-II(H1.5L)] (BF4)(0.5) (2) ( = [Fe-II(H3L)][Fe-II(L)]BF4), [Fe(H1.5L)]BF4 (3) ( = [Fe-II(H3L)][Fe-III(L)](BF4)(2)), [Fe-III(H3L)](BF4)(3).fim.H2O (4), and [Fe-III(L)].2.5H(2)O (5), has been synthesized and characterized. The single-crystal X-ray structure of each complex has been determined. The Fell compound, 2, and a mixed valence Fe-II-Fe-III compound, 3, involve formally hemi-deprotonated ligands, H1.5L. The structure of 3 consists of a homochiral two-dimensional assembled sheet, arising from the intermolecular hydrogen bonds between [Fe-II(H3L)](2+) and [Fe-III(L)](0) (3). All but 5 exhibit spin crossover between low-spin (LS) and high-spin (HS) states. This is a rare case where both Fe-II and Fe-III complexes containing the same ligand exhibit spin-crossover behavior. Magnetic susceptibility and Mossbauer studies showed that 3 has three accessible electronic states: LS Fe-II-LS Fe-III, HS Fe-II-LS Fe-III, and HS Fe-II-HS Fe-III. Compounds 1-3 show the light-induced excited spin-state trapping effect at the Fell sites upon irradiation with green light. The solution magnetic properties, electronic spectra, and electrochemical properties of 1, 4, and 5 were also studied.

    DOI: 10.1021/ic0498384

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  • Ferromagnetic Ni-II-Gd-III interactions in complexes with NiGd, NiGdNi, and NiGdGdNi cores supported by tripodal ligands

    T Yamaguchi, Y Sunatsuki, M Kojima, H Akashi, M Tsuchimoto, N Re, S Osa, N Matsumoto

    CHEMICAL COMMUNICATIONS   2004 ( 9 )   1048 - 1049   2004年5月

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    Dinuclear [(NiL)Gd(hfac)(2)(EtOH)] (H3L = 1,1,1-tris(N-salicy-lideneaminomethyl)ethane, Hhfac = hexafluoroacetylacetone), trinuclear [(NiL)(2)Gd(NO3)], and tetranuclear [(NiL)Gd(CH3-CO2)(2)(MeOH)](2) complexes, were prepared by treating [Ni(HL)] with [Gd(hfac)(3)(H2O)(2)], Gd(NO3)(3).6H(2)O, and Gd(CH3CO2)(3).4H(2)O, respectively, in the presence of Et3N. All the complexes show that ferromagnetic interactions occur between the Ni-II and Gd-III ions.

    DOI: 10.1039/b401033g

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  • A tripodal ligand containing three imidazole groups inducing spin crossover in both Fe(II) and Fe(III) complexes; Structures and spin crossover behaviors of the complexes

    H Ohta, Y Sunatsuki, M Kojima, S Iijima, H Akashi, N Matsumoto

    CHEMISTRY LETTERS   33 ( 3 )   350 - 351   2004年3月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    A tripodal hexadentate ligand containing three imidazole groups gives spin-crossover iron complexes in both the +II and the +III oxidation states. The tetrafluoroborate salt of the Fe(II) complex shows a gradual spin transition in the temperature range 110-270 K. The corresponding Fe(III) complex shows a spin transition above 150 K, and at 300 K ca. 87% of the Fe(III) ion is in the high-spin state.

    DOI: 10.1246/cl.2004.350

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  • A New Family of Spin Crossover Complexes with a Tripod Ligand Containing Three Imidazoles: Synthesis, Characterization, and Magnetic Properties of [FeIIH3LMe](NO3)2・1.5H2O, [FeIIILMe・3.5H2O, [FeIIH3LMe][FeIILMe]NO3, and [FeIIH3LMe][FeIIILMe](NO3)2 (H3L・・・

    Yuichi Ikuta, Makoto Ooidemizu, Yuichi Yamahata, Masahiro Yamada, Shutaro Osa, Naohide Matsumoto, Seiichiro Iijima, Yukinari Sunatsuki, Masaaki Kojima, Francoise Dahan, Jean-Pierre Tuchagues

    Inorganic Chemistry   42 ( 22 )   7001 - 7017   2003年11月

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    記述言語:英語  

    A New Family of Spin Crossover Complexes with a Tripod Ligand Containing Three Imidazoles: Synthesis, Characterization, and Magnetic Properties of [FeIIH3LMe](NO3)2・1.5H2O, [FeIIILMe・3.5H2O, [FeIIH3LMe][FeIILMe]NO3, and [FeIIH3LMe][FeIIILMe](NO3)2 (H3LMe = Tris[2-(((2-methylimidazol-4-yl)methylidene)amino)ethyl]amine)

    DOI: 10.1021/ic034495f

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  • Synthesis and magnetic properties of heterometal cyclic tetranuclear complexes [(CuLMII)-L-II(hfac)](2) (M-II = Zn, Cu, Ni, Co, Fe, Mn; H3L=1-(2-hydroxybenzamido)-2-((2-hydroxy-3-methoxybenzylidene)amino)ethane; Hhfac = hexafluoroacetylacetone)

    S Osa, Y Sunatsuki, Y Yamamoto, M Nakamura, T Shimamoto, N Matsumoto, N Re

    INORGANIC CHEMISTRY   42 ( 18 )   5507 - 5512   2003年9月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    DOI: 10.1021/ic0344012

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  • Nature of Copper(II)-Lanthanide(III) Magnetic Interactions and Generation of a Large Magnetic Moment with Magnetic Anisotropy of 3d-4f Cyclic Cylindrical Tetranuclear Complexes [CuIILLnIII(hfac)2]2, (H3L = 1-(2-Hydroxybenzamido)-2-(2-hydroxy-3-methoxyb・・・

    Takafumi Kido, Yuichi Ikuta, Yukinari Sunatsuki, Yoshihiro Ogawa, Naohide Matsumoto, Nazzareno Re

    Inorganic Chemistry   42 ( 2 )   398 - 408   2003年1月

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    記述言語:英語  

    Nature of Copper(II)-Lanthanide(III) Magnetic Interactions and Generation of a Large Magnetic Moment with Magnetic Anisotropy of 3d-4f Cyclic Cylindrical Tetranuclear Complexes [CuIILLnIII(hfac)2]2, (H3L = 1-(2-Hydroxybenzamido)-2-(2-hydroxy-3-methoxybenzylideneamino)ethane and Hhfac = Hexafluoroacetylacetone, LnIII = Eu, Gd, Tb, Dy)

    DOI: 10.1021/ic026045d

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  • An unprecedented homochiral mixed-valence spin-crossover compound

    Y Sunatsuki, Y Ikuta, N Matsumoto, H Ohta, M Kojima, S Iijima, S Hayami, Y Maeda, S Kaizaki, F Dahan, JP Tuchagues

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   42 ( 14 )   1614 - 1618   2003年

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    記述言語:英語   出版者・発行元:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/anie.200250399

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  • Spin Crossover in a Suprsmolecular FeII-FeIII System

    Hiromi Ohta, Yukinari Sunatsuki, Yuichi Ikuta, Naohide Matsumoto, Seiichiro Iijima, Haruo Akashi, Takashi Kambe, Masaaki Kojima

    Material Science   21   191 - 199   2003年

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  • Copper(II) complexes with multidentate Schiff-base ligands containing imidazole groups: ligand-complex or self-complementary molecule?

    Y Sunatsuki, Y Motoda, N Matsumoto

    COORDINATION CHEMISTRY REVIEWS   226 ( 1-2 )   199 - 209   2002年3月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    The copper(II) complexes with multidentate Schiff-base ligands containing imidazole groups have potentially donor and acceptor character in the formation of a coordination bond and a hydrogen bond. They can function as a ligand-complex or as a self-complementary building block for the construction of the assembly structure due to the formation of a coordination bond or a hydrogen bond. In such self-complementary complexes, the monomer is stabilized as a protonated species under acidic conditions, while under appropriate basic conditions the generated imidazolate nitrogen atom coordinates to the Cu(II) ion of the adjacent unit or hydrogen-bonds to the imidazole group of the adjacent unit to give assembly structures in the crystals, depending on the ligand framework and the preferred coordination number of the Cu(II) ion. The interconversion between the monomer and the self-assembled oligomer is reversible by pH adjustment. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0010-8545(01)00417-9

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  • Spontaneous resolution induced by self-organization of chiral self-complementary cobalt(III) complexes with achiral tripod-type ligands containing three imidazole groups

    Katsuki, I, Y Motoda, Y Sunatsuki, N Matsumoto, T Nakashima, M Kojima

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   124 ( 4 )   629 - 640   2002年1月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    The progression from synthetically achiral ligand and metal ion, to isolated chiral metal complex, to homochiral two-dimensional (2D) assembly layer, and finally to conglomerate is presented. The cobalt(III) complexes of achiral tripod-type ligands involving three imidazole groups with the chemical formulas [Co(H3L6)](ClO4)(3).H2O (6) and [Co(H3L7)](ClO4)(3).0.5H(2)O (7) were synthesized, where H3L6 = tris[2-(((imidazol-4-yl)methylidene)amino)ethyl]amine and H3L7 = tris[2-(((2-methylimidazol-4-yl)methylidene)amino)ethyl]amine. Each complex induces the chirality of clockwise (C) and anticlockwise (A) enantiomers due to the screw coordination arrangement of the achiral tripod-type ligand around the Co(III) ion. The fully protonated (6, 7), the formally hemi-deprotonated (6', 7'), and the fully deprotonated (6", 7") complexes were obtained as good quality crystals by adjusting the pH of the solutions. The crystal structures were determined by single-crystal X-ray analyses. There is no intermolecular network structure in the fully protonated complexes (6, 7). The fully deprotonated complexes (6", 7") form a hydrogen-bonded network structure, in which the C and A enantiomers coexist and are connected through a water molecule. The formally hemi-deprotonated species [Co(H1.5L6 (or 7))](1.5+), which functions as a self-complementary chiral building block, generates equal numbers of protonated and deprotonated molecules by an acid-base reaction to form an extended 2D homochiral layer structure consisting of a hexanuclear structure with a trigonal void as a unit. The 2D structure arises from the intermolecular imidazole-imidazolate hydrogen bonds between [Co(H3L6 (or 7))](3+) and [Co(L-6 or 7](0), in which adjacent molecules with the same chirality are arrayed in an up-and-down fashion. In the crystal lattices of the perchlorate salts (6', 7'), the perchlorate ions are located in the cavity, and the homochiral layer consisting of C enantiomers and the adjacent layer consisting of A enantiomers are stacked alternately to give an achiral crystal. The chloride salt of the hemi-deprotonated complex [Co(H1.5L6)]Cl-1.5.4H(2)O (6a') is found to be a conglomerate, in which the chloride ions are positioned in the intermediate region of the double layer, and layers with the same chirality are well stacked by adopting the up-and-down layer's shape to generate channels, and so form a chiral crystal. The circular dichroism (CD) spectrum of 6a' showed a positive peak and a negative peak at 480 and 350 nm, respectively, and the spectrum of another crystal showed an enantiomeric CD pattern, providing further evidence of spontaneous resolution on crystallization.

    DOI: 10.1021/ja0123960

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  • Antiferromagnetism induced by successive protonation of terminal phenol groups of a bis(μ-phenoxide)-bridged dicopper(II,II) complex

    Hiromi Saimiya, Yukinari Sunatsuki, Masaaki Kojima, Setsuo Kashino, Takashi Kambe, Masakazu Hirotsu, Haruo Akashi, Kiyohiko Nakajima, Tadashi Tokii

    Journal of Chemical Society, Dalton Transactions   2002 ( 19 )   3737 - 3742   2002年

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  • Hydrogen-bonded extended structure of the 1 : 3 adduct of a C-3 symmetric cobalt(III) complex with a tripod-ligand involving three imidazolate groups and hydroquinone or resorcinol

    S Nagasato, Y Sunatsuki, S Ohsato, T Kido, N Matsumoto, M Kojima

    CHEMICAL COMMUNICATIONS   ( 1 )   14 - 15   2002年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    The assembly reaction arising from hydrogen bonding between a chiral C-3 symmetric cobalt(III) complex and a tripod-ligand involving three imidazolate groups [tris[2-(((2-methylimidazolato-4-yl) methylidene) amino) ethyl] amine] cobalt(III) and either hydroquinone or resorcinol gave the 1:3 adducts, with 3D extended structures showing the template effect of the complex.

    DOI: 10.1039/b107741d

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  • Thermal and pressure induced spin crossover of a novel iron (III) complex with a tripodal ligand involving three imidazole groups

    Y Sunatsuki, M Sakata, S Matsuzaki, N Matsumoto, M Kojima

    CHEMISTRY LETTERS   ( 12 )   1254 - 1255   2001年12月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    A novel spin crossover Fe(III) complex, [Fe(H3L)](ClO4)(3). (4-fim).H2O (H3L = tris[2-(((imidazol-4-yl)methylene)amino)-ethyl]amine, 4-fim = 4-formylimidazole), was synthesized and the crystal structure was determined at 293 K. Cryomagnetic measurements revealed a two-step spin conversion and a pressure induced spin crossover was observed.

    DOI: 10.1246/cl.2001.1254

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  • Correlation among crystal shape, absolute configuration, and circular dichroism spectrum of enantiomorphs of tris[2-(((2-phenylimidazol-4-yl)methylidene)amino)ethyl]-aminemetal(II) nitrate-methanol (1/1)

    S Nagasato, Katsuki, I, Y Motoda, Y Sunatsuki, N Matsumoto, M Kojima

    INORGANIC CHEMISTRY   40 ( 11 )   2534 - 2540   2001年5月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    A series of metal(III) complexes of a tripod-type ligand with the chemical formulas [M(H3L)](NO3)(2). MeOH (M = Mn (1), Fe (2), Co (3), Ni (4), Zn (6)) and [Cu(H3L)](NO3)(2). CH3CN .H2O (5) were synthesized and characterized (H3L = tris [2-(((2-phenylimidazol-4-yl)methylidene)amino)ethyl]amine). The crystal structures were determined, in which those of 1-4 and 6 are isomorphous and conglomerates, because they crystallize into the acentric space group P2(1)2(1)2(1). Each metal(II) ion of 1-4 and 6 assumes an octahedral coordination environment with the N-6 donor atoms of the tripod ligand and becomes either a C (clockwise) or an A (anticlockwise) enantiomorph because of the screw arrangement of the tripod-type ligand around the metal(II) ion. The crystals were divided into two groups, where their crystal shapes are mirror images and their CD spectra show enantiomeric patterns. The circular dichroism (CD) spectrum of the crystal used for the X-ray analysis was measured. The absolute configuration of the enantiomorph of the crystal used for the X-ray analysis was determined by the Flack parameter. The correlation among the crystal shape, the absolute configuration, and the CD spectral pattern was thus confirmed for 1-4 and 6. On the other hand, 5 assumes a square pyramidal coordination geometry with the Ns donor atoms, and hence, there are no optical isomers.

    DOI: 10.1021/ic001254o

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  • スピンクロスオーバー現象による記録素子と表示素子

    砂月幸成, 松本尚英

    化学   56 ( 11 )   64 - 65   2001年

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  • Simple methods for preparation of a well-defined 4-pyridinethiol modified surface on Au(111) electrodes for cytochrome c electrochemistry

    Taniguchi, I, S Yoshimoto, M Yoshida, S Kobayashi, T Miyawaki, Y Aono, Y Sunatsuki, H Taira

    ELECTROCHIMICA ACTA   45 ( 18 )   2843 - 2853   2000年

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    A very small amount of sulfide impurity in 4-pyridinethiol (4-PySH) modifier solution was found to interfere with the proper formation of the 4-PySH modified surface for cytochrome c electrochemistry on an Au(111) electrode. When the modification was conducted in an alkaline (e.g. 0.1 M KOH) solution, in aqueous solutions under applying a potential more positive than 0.3 V vs. Ag/AgCl, or at a low modifier concentration (e.g. 20 mu M). the proper 4-PySH modified surface was obtained even using 4-PySH as received, which contained a small amount of sulfide. The selective adsorption of 4-PySH in the presence of a small amount of sulfide under these conditions was due to the rapid formation of proper 9-PySH modified surface, which prevented the sulfide from reacting with the electrode surface. (C) 2000 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0013-4686(00)00358-3

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  • A cyclic tetranuclear Cu2Gd2 complex with an S=8 ground state derived from ferromagnetic spin-coupling between copper(II) and gadolinium(III) ions arrayed alternately

    T Kido, S Nagasato, Y Sunatsuki, N Matsumoto

    CHEMICAL COMMUNICATIONS   ( 21 )   2113 - 2114   2000年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    A cyclic tetranuclear (Cu2Gd2III)-Gd-II complex, in which Cu-II and Gd-III ions are arrayed alternately, has an S = 8 spin ground state, due to the ferromagnetic spin coupling between S-Gd = 7/2 and S-Cu = 1/2.

    DOI: 10.1039/b006445i

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  • Potential and pH dependencies of adsorbed species of 2-, 4-pyridinethiol and 2-pyrimidinethiol on Au(111) electrode

    Taniguchi, I, S Yoshimoto, Y Sunatsuki, K Nishiyama

    ELECTROCHEMISTRY   67 ( 12 )   1197 - 1199   1999年12月

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    記述言語:英語   出版者・発行元:ELECTROCHEMICAL SOC JAPAN  

    Potential and pH dependencies of surface structures of Au(111) electrodes modified with 2- and 4-pyridinethiol (2-PySH and 4-PySH, respectively) and 2-pyrimidinethiol (2-PymSH) were examined by surface-enhanced IR absorption spectroscopy (SEIRAS) and STM. At positive potentials, the pKa values of the adsorbed pyridinethiol and pyrimidine species decreased, and even in an acid solution the pyridine (or pyrimidine) N atom became less protonated. Therefore, STM images of self-assembled monolayers of these thiols observed at properly positive potentials (e.g., &gt; ca. 0.3 V vs. Ag/AgCl for 2-PySH and 2-PymSH in a 0.1 M HClO4 solution, and &gt;0.7 V vs. Ag/AgCl for 4-PySH in a 0.01 M (M = mol dm(-3)) HClO4 solution) can be used for evaluating the structures in a neutral solution.

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  • Synthesis, magnetic properties, and incomplete double-cubane structure of manganese(III)-metal(II) complexes [Mn(MeOH)L(OH)M(bpy)](2) (M = Zn, Cu, Ni, and Mn; H4L = 1,2-bis(2-hydroxybenzamido)benzene; bpy = 2,2 '-bipyridine). (vol 37, pg 5566, 1998)

    Y Sunatsuki, H Shimada, T Matsuo, M Nakamura, F Kai, N Matsumoto, N Re

    INORGANIC CHEMISTRY   38 ( 11 )   2756 - 2756   1999年5月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

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  • [{Mn(salen)CN}(n)]: The first one-dimensional chain with alternating high-spin and low-spin Mn-III centers exhibits metamagnetism

    N Matsumoto, Y Sunatsuki, H Miyasaka, Y Hashimoto, D Luneau, JP Tuchagues

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   38 ( 1-2 )   171 - 173   1999年

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    記述言語:英語   出版者・発行元:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/(SICI)1521-3773(19990115)38:1/2<171::AID-ANIE171>3.0.CO;2-U

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▼全件表示

講演・口頭発表等

  • Iron(II) complexes having dinuclear mesocate, tetranuclear tetrahedron, and octanuclear bicapped trigonal prism structures with (imidazole–imine)-type bis(bidentate) ligands: their structures and spin-crossover behavior 国際会議

    Tubasa Tanaka, Yukinari Sunatsuki, Takayoshi Suzuki

    Pacifichem 2021  2021年12月17日  Pacific Basin Chemical Societies

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    開催年月日: 2021年12月16日 - 2021年12月21日

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Virtual   国名:アメリカ合衆国  

    その他リンク: https://pacifichem.org/

  • Iron(II) complexes having dinuclear mesocate, tetranuclear tetrahedron, and octanuclear bicapped trigonal prism structures with (imidazole–imine)-type bis(bidentate) ligands: their structures and spin-crossover behavior

    Tubasa Tanaka, Yukinari Sunatsuki, Takayoshi Suzuki

    Pacifichem 2021  2021年12月17日 

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    開催年月日: 2021年12月16日 - 2021年12月21日

    記述言語:英語   会議種別:口頭発表(一般)  

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  • Structural characterization and racemization of transition-metal complexes bearing a Schiff base ligand derived from L-histidine methyl ester

    R. Ogawa, T. Suzuki, Y. Sunatsuki

    43rd International Conference on Coordination Chemistry  2018年 

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    開催年月日: 2018年7月30日 - 2018年8月4日

    記述言語:英語   会議種別:ポスター発表  

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  • Hydrogen bonding assembling structures and spin-crossover behavior of polymorphs of iron(II) complexes with imidazole containing bidentate Schiff base ligands

    Y. Sunatsuki, T. Suzuki, N. Matsumoto

    43rd International Conference on Coordination Chemistry 

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    開催年月日: 2018年7月30日 - 2018年8月4日

    記述言語:英語   会議種別:口頭発表(一般)  

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  • Structures and properties of group 10 metal complexes bearing 2-methyl- or 2-phenyl-8-diphenylphoshinoquinoline

    M. Mori, K. Ariyoshi, Y. Sunatsuki, T. Suzuki

    43rd International Conference on Coordination Chemistry 

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    開催年月日: 2018年7月30日 - 2018年8月4日

    記述言語:英語   会議種別:口頭発表(一般)  

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  • Hydrogen-bonding Supramolecular Assembly of S6-Symmetric Cobalt(II) Complex with Tris-bidentate Metalloligand

    R. Mitsuhashi, K. Pedersen, T. Ueda, T. Suzuki, J. Bendix, M. Mikuriya

    43rd International Conference on Coordination Chemistry 

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    開催年月日: 2018年7月30日 - 2018年8月4日

    記述言語:英語   会議種別:口頭発表(一般)  

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  • Scan rate dependent spin-crossover behavior of two polymorphs of an iron(II) complex with an imidazole containing bidentate Schiff base ligand

    Cooperative Symposium among Universities of Toulouse, Copenhagen, and Okayama  2016年 

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  • Molecular Structures of two Polymorphs of an Iron(II) Complex with an Imidazole Containing Bidentate Schiff Base Ligand and Their Scan Rate Dependent Spin-Crossover Behavior

    XXth International Winter School on Coordination Chemistry  2016年 

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    記述言語:英語   会議種別:口頭発表(一般)  

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  • Oxidation Reactions and Magnetic Properties of Co(II) Complexes with Strand-Type Hexadentate Ligands Having Thioether-Amidato-Pyridyl Donor Set

    The 23rd International SPACC Symposium  2016年 

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  • Structures and Properties of Transition Metal Complexes with Schiff-base Ligands Derived from L-Hystidine or L-Hystidine Methyl Ester

    錯体化学会 第66回討論会  2016年 

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  • 水素結合ドナーとアクセプターを有する非対称二座配位子を用いた四配位コバルト(II)錯体の合成と性質

    錯体化学会 第66回討論会  2016年 

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  • イミダゾール基を含むビス(二座配位)型シッフ塩基を用いた二核鉄(II)錯体の合成と性質

    錯体化学会 第66回討論会  2016年 

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  • カルシウムイオンと有機アニオンを用いたロジウム(III)ーチミナト(2ー)環状四殻ユニットの連結

    錯体化学会 第66回討論会  2016年 

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  • 三座シッフ塩基配位子を含む Zn-Tb-Zn 型三核錯体の完全自然分晶の検証

    錯体化学会 第66回討論会  2016年 

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  • Synthesis and Properties of Nickel, Palladium and Platinum Complexes Containing Substituted 8-(Diphenylphosphino)quinolines

    錯体化学会 第66回討論会  2016年 

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  • Synthesis, structures, magnetic properties and oxidation reactions of Co(II) complexes with strand-type hexadentate ligands having thioether-amidato-pyridyl donor set

    42nd International Conference on Coordination Chemistry  2016年 

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  • リチウムまたはカルシウムイオンが結合した不完全キュバン型マンガンクラスターの構築

    日本化学会第96春季年会  2016年 

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  • Scan Rate Dependent Spin-Crossover and Porymorphs of Iron(II) Complex with an Imidazole Containing Bidentate Schiff Base Ligand

    The 15th International Conference on Molecul-Based Magnets  2016年 

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  • 三脚状三座ホスフィン配位子を含むヒドリド架橋二核ロジウム(III)錯体の光応答性

    第65回錯体化学討論会  2015年 

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  • Synthesis, crystal structure and magnetic properties of the face-shared triply bridged linear trinuclear complexes

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Multinuclear iron(II) complexes bridged by tetradentate bis(Schiff base)-type ligands

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Magnetic behaviors and oxidation reactions of cobalt(II) complexes with strand-type hexadentate ligands containing thioether and amidate donor groups

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Synthesis, structures, and properties of mono-, di-, and tetranuclear manganese complexes with unsymmetrical tridentate ligands derived from N-(aminoalkyl)salicylamide

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Palladium(II) mononuclear and palladium(II)/ruthenium(II) heterodinuclear complexes bearing a quinoline-2-carbaldehyde (pyridine-2-carbonyl)hydrazone

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Synthesis and structures of platinum(II) complexes containing 8-(dimethyl or diphenylphosphino)quinoline

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • 8位にホスフィノ基を有するキノリン誘導体を含む新規パラジウム(II)、白金(II)錯体の合成と性質

    2015年日本化学会中国四国支部大会  2015年 

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  • イミダゾール基を含むbis-bidentate型シッフ塩基配位子を用いた多核鉄(II)錯体の合成と性質

    2015年日本化学会中国四国支部大会  2015年 

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  • 2-キノリル置換基を含むピリジル-2-カルボニルヒドラゾンを用いたパラジウム(II)/ルテニウム(II)錯体の合成と性質

    2015年日本化学会中国四国支部大会  2015年 

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  • チオエーテルとアミダトおよびピリジル供与基を含む直鎖型六座配位子を用いたコバルト(II)錯体のスピンクロスオーバーと酸化反応

    2015年日本化学会中国四国支部大会  2015年 

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  • 三脚状三座ホスフィン配位子を含むヒドリド架橋二核ロジウム(III)錯体のクロモトロピズム

    2015年日本化学会中国四国支部大会  2015年 

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  • L-ヒスチジンメチルエステルから誘導したシッフ塩基を含む遷移金属錯体の構造と酸化還元挙動

    2015年日本化学会中国四国支部大会  2015年 

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  • 8位にホスフィノ基を有するキノリン誘導体を含む新規白金錯体の合成と性質

    第65回錯体化学討論会  2015年 

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  • Chromotropism of hydrido-bridged dinuclear rhodium(III) complexes containing a tripodal tridentate phosphine ligands

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • Thyminate(2–)-bridged cyclic tetranuclear rhodium(III) complexes formed by a template of a sodium, calcium or lanthanoid ion

    The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem 2015)  2015年 

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  • カルシウムイオンをテンプレートとしたチミナト(2‒)架橋ロジウム(Ⅲ)環状四核錯体の構造

    2015年日本化学会中国四国支部大会  2015年 

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  • L-ヒスチジンから誘導したシッフ塩基を含む遷移金属錯体の合成と性質

    第65回錯体化学討論会  2015年 

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  • Spontaneous Resolution of Transition-Metal Complexes Containing a Tripodal Hexadentate Schiff-Base Ligand Derived from 1,1,1-Tris(2-aminomethyl)ethane and 4-Formylimidazole

    第65回錯体化学討論会  2015年 

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  • 1H-イミダゾール-4-カルバルデヒド-2-ピリジルヒドラゾン誘導体を含むルテニウム(II)錯体の合成と構造および性質

    日本化学会第95春季年会  2015年 

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  • L-ヒスチジンから誘導したシッフ塩基を含む金属錯体の合成と性質

    日本化学会第95春季年会  2015年 

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  • チオエーテルおよびアミダト供与基を含む直鎖状六座配位子を用いたコバルト(II/III) 錯体の磁気的性質と酸化反応

    日本化学会第95春季年会  2015年 

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  • イミダゾール基を含むbis-bidentate型シッフ塩基を用いた多核鉄(II)錯体の合成

    第65回錯体化学討論会  2015年 

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  • ヒドラゾン骨格を有する非対称三座配位子を用いたルテニウム(II)錯体の合成と性質

    第65回錯体化学討論会  2015年 

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  • チオエーテルとアミダトおよびピリジル供与基を含む直鎖状六座配位子を用いたコバルト(II/III) 錯体の合成と性質

    第65回錯体化学討論会  2015年 

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  • Ssynthesis, Structures, and Properties of Manganese Complexes with Unsymmetriical Tridentate Ligands Derived from N-(Aminoalkyl)salcylamide

    XIXth International Winter School on Coordination Chemistry  2014年 

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  • Iron Complexes with an Imidazol Containing Bis-bidentate Type Ligand

    XIXth International Winter School on Coordination Chemistry  2014年 

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  • Chiral Incomplere-cubane Type Manganese(III) Clusters Containing A Bridging Methoxido or Hydroxido Ligand

    2014 International Conference on Artificial Photosynthesis  2014年 

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  • L-ヒスチジンとサリチルアルデヒドから誘導したシッフ塩基を含む金属錯体の合成と性質

    2014年日本化学会中国四国支部大会  2014年 

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  • チミナト(2–)を架橋配位子に用いたロジウム(III)環状四核錯体の構造と性質

    2014年日本化学会中国四国支部大会  2014年 

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  • 1,1,1-トリスアミノメチルエタンから誘導される三脚型シッフ塩基配位子を用いた異種金属三核錯体の合成と性質

    2014年日本化学会中国四国支部大会  2014年 

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  • 三脚型配位子と二座配位子からなる強発光性希土類錯体の合成、構造、磁性

    錯体化学会第64回討論会  2014年 

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  • Polymorphism of Spin Crossover Iron(II) Complexes fac-[FeII(HLn-R)3]Cl PF6 (HLn-R = 2-methylimidazol-4-yl-methylideneamino-n-propyl

    錯体化学会第64回討論会  2014年 

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  • fac-mer型構造異性をもつ希土類錯体の合成、構造、発光、単イオン磁石挙動

    錯体化学会第64回討論会  2014年 

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  • C3対称を持つ単核希土類錯体の合成、構造、発光、単イオン磁石挙動

    錯体化学会第64回討論会  2014年 

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  • チオエーテルおよびアミダト供与基を含む直鎖型六座配位子を用いたコバルト(II)錯体のスピンクロスオーバー

    錯体化学会第64回討論会  2014年 

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  • クロモトロピズムを示すヒドリド架橋二核ロジウム(III)錯体における共存配位子の効果

    錯体化学会第64回討論会  2014年 

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  • 非対称アミン-アミド-フェノール型三座配位子を用いたマンガン錯体の合成と構造

    錯体化学会第64回討論会  2014年 

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  • イミダゾール基を含む三脚型シッフ塩基配位子の鉄錯体を構築素子とする異種金属多核錯体の構造と性質

    錯体化学会第64回討論会  2014年 

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  • Thyminate(2–)を架橋配位子に用いたCp*Rh環状四核錯体の構造と性質

    錯体化学会第64回討論会  2014年 

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  • 三脚型六座配位子を用いた面共有三核錯体の合成と性質

    錯体化学会第64回討論会  2014年 

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  • キラルな多座シッフ塩基配位子を用いたMnクラスターの構築

    錯体化学会第64回討論会  2014年 

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  • ヒドラゾン骨格を有するRu錯体のプロトン付加解離と酸化還元挙動

    錯体化学会第64回討論会  2014年 

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  • Dinucleating Ability and Proton-Coupled Electron Transfer Behavior of Substituted Hydrazone Ruthenium(II) Complexes

    41st International Conference on Coordination Chemistry  2014年 

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  • Conversion of the Bridging Mode of Thyminate(2–) in Cyclic Tetranuclear Rhodium(III) Complexes Caused by the Incorporated Cation

    41st International Conference on Coordination Chemistry  2014年 

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  • Chiral Incomplere-cubane Type Manganese(III) Clusters Containing A Bridging Methoxido or Hydroxido Ligand

    41st International Conference on Coordination Chemistry  2014年 

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  • Attempts in Preparing Transition-Metal Complexes with L-histidine Derivatives toward Manganese Oxido Cluster

    Workshop and knowledge transfer on advanced spectroscopy and theoretical modeling of bioinorganic systems  2014年 

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  • Simultaneous Oxidation and Deprotonation of Substituted Hydrazone Ruthenium(II) Complex

    Workshop and knowledge transfer on advanced spectroscopy and theoretical modeling of bioinorganic systems  2014年 

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  • Multi-electron Oxidative Dehydrogenation in Ruthenium(III) Complexes

    Workshop and knowledge transfer on advanced spectroscopy and theoretical modeling of bioinorganic systems  2014年 

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  • ヒドラゾン化合物を配位子とするRu(II)錯体におけるプロトン解離に伴う酸化挙動

    日本化学会第94春季年会  2014年 

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  • チオエーテルおよびアミダト供与基を含む直鎖型六座配位子を用いたコバルト(II/III)錯体の合成と性質

    日本化学会第94春季年会  2014年 

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  • 三脚状三座ホスフィン配位子を含むヒドリド架橋二核ロジウム(III)錯体のクロモトロピズム

    日本化学会第94春季年会  2014年 

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  • Mn2+イオンで架橋した二重不完全キュバン型構造をもつ(MnIII3)2MnIIクラスターの構築

    日本化学会第94春季年会  2014年 

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  • Chromotropism of Hydrido-Bridged Dinuclear Rhodium(III) Complexes Containing Tridentate Phosphine Ligands

    XIXth International Winter School on Coordination Chemistry  2014年 

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  • 面共有型架橋構造を有するFeII-MII-FeII型三核錯体の合成と性質

    第63回錯体化学討論会  2013年 

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  • Redox Behavior of Ruthenium(II/III) Complex with 2-(1,4,5,6-Tetrahydropyrimidyl)phenolate Ligand

    錯体分子素子研究センター「新規分子磁性化合物の探索」2013年シンポジウム  2013年 

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  • Cyclic Tetranuclear Rhodium(III) Complexes Bridged by Thyminate(2–) and Incorporating an Alkali, Alkali Earth or Lanthanide Ion

    錯体分子素子研究センター「新規分子磁性化合物の探索」2013年シンポジウム  2013年 

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  • 2-(1,4,5,6-テトラヒドロピリミジル)-2-フェノレート配位子を用いたルテニウム錯体の塩基応答性酸化還元挙動

    日本化学会第93春季年会  2013年 

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  • Tetradecanuclear Nickel(II) Cage Complex with Imidazole Containing Ligand Having an Encapsulating Ability for Small Molecule

    International Kick-Off Symposium for ISMCBC  2013年 

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  • 三脚型Schiff塩基配位子を用いた単核バナジル錯体とその多核化の検討

    2013年日本化学会中国四国支部大会  2013年 

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  • ヒドロキシル基またはカルボキシル基を持つ単座ホスフィン配位子を含むコバルト(III)錯体の合成と性質

    2013年日本化学会中国四国支部大会  2013年 

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  • Thyminato(1−)-κN1またはadeninato-κN9を配位子とするRh(III)およびIr(III)錯体の合成とその水素結合相互作用

    第63回錯体化学討論会  2013年 

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  • Cp*Rh環状四核錯体に取り込まれた陽イオンによるthyminate(2–)の架橋構造変換

    第63回錯体化学討論会  2013年 

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  • Four-electron Oxidative Dehydrogenation Induced by Proton-coupled Electron transfer in Ruthenium(III) Complex with 2-(1,4,5,6-Tetrahydropyrimidin-2-yl)phenolate

    第63回錯体化学討論会  2013年 

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  • ヒドラゾン化合物を架橋配位子に用いた Ruー3d 金属二核錯体の合成と性質

    第63回錯体化学討論会  2013年 

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  • 特異な置換基を有する単座リン供与配位子を含むコバルト(III)錯体の合成と性質

    第63回錯体化学討論会  2013年 

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  • 三脚型 Schiff 塩基配位子を用いたバナジル錯体の合成と性質

    第63回錯体化学討論会  2013年 

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  • 4−ホルミルイミダゾールから誘導される三脚型六座シッフ塩基配位子を含む単核 錯体の対イオン効果による特異な結晶化挙動

    第63回錯体化学討論会  2013年 

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  • (S)-4-アミノ-2-ヒドロキシ酪酸から誘導した Schiff 塩基配位子を用いた三核 Mn クラス ターの構築

    第63回錯体化学討論会  2013年 

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  • 2-位を修飾した 8-キノリルホスファンを含む遷移金属錯体の合成と性質

    第63回錯体化学討論会  2013年 

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  • Cobalt(II) Complexes with Unsymmetric Tridentate Hydrazone-Based Ligands

    40th International Conference on Coordination Chemistry  2012年 

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  • Preparation of novel metal complexes bearing nucleobases and their hydrogen-bonding interactions

    XVIIIth International Winter School on Coordination Chemistry  2012年 

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  • A novel base-responsive reduction of ruthenium complexes bearing phenolate-based ligands with π-conjugating N-H bond

    XVIIIth International Winter School on Coordination Chemistry  2012年 

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  • Mononuclear and dinuclear metal complexes containing 5-methyletrazolate and its derivative

    XVIIIth International Winter School on Coordination Chemistry  2012年 

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  • Tetradecanuclear cage complexes with imidazole containing ligands having an ability to encapsulate small molecules

    XVIIIth International Winter School on Coordination Chemistry  2012年 

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  • Tetradecanuclear cubic cage complexes with imidazole containing ligands

    The Third Symposium in Commemoration of International Exchange Agreement between Faculty of Science, University of Copenhagen, Denmark and Graduate School of Natural Science and Technology, Okayama University, Japan  2012年 

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  • 炭酸イオン架橋4核ニッケル(II)−ガドリニウム(III)錯体の合成、構造、磁性

    2012年日本化学会西日本大会  2012年 

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  • 配位子場強度を調整した平面四座シッフ塩基配位子とイミダゾールからなるFe(III)錯体の集積構造とスピン平衡

    2012年日本化学会西日本大会  2012年 

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  • テトラゾラト誘導体を架橋配位子として用いたパラジウム(II)を含む異種金属二核錯体の立体構造制御

    2012年日本化学会西日本大会  2012年 

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  • Chiral 14 nuclear Ni(II) cage complex

    錯体分子素子研究センター「新規分子磁性化合物の探索」2012年シンポジウム  2012年 

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  • 核酸塩基を配位子とする新規金属錯体の合成とその水素結合相互作用

    第62回錯体化学討論会  2012年 

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  • トリス(ヒドロキシメチル)ホスフィンを含むコバルト(III)錯体の合成と性質

    第62回錯体化学討論会  2012年 

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  • イミダゾール−4−カルボアルデヒドアジン類を配位子とする単核及び多核錯体の合成と性質

    第62回錯体化学討論会  2012年 

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  • Thyminate(2–)を構成ユニットとするCp*Rh(III)四核錯体

    第62回錯体化学討論会  2012年 

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  • N,N’−ビス(4−イミダゾリルメチレン)トリアミン型五座配位子を用いたNi(II)錯体の合成と性質

    第62回錯体化学討論会  2012年 

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  • テトラゾラト誘導体を架橋配位子として用いたパラジウム(II)を含む異種金属二核錯体の立体構造制御

    第62回錯体化学討論会  2012年 

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  • テトラヒドロピリミジル基またはイミダゾリニル基を有するフェノレート配位子を用いたRu(II/III)錯体の酸化還元挙動

    第62回錯体化学討論会  2012年 

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  • ヒドラゾン化合物を架橋配位子とした異種二核金属錯体の合成とその電子状態

    第62回錯体化学討論会  2012年 

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  • SCOの発現を目指したヒドラゾン部位を含む非対称配位子を用いたコバルト(II)錯体の構築

    第62回錯体化学討論会  2012年 

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  • 三脚型シッフ塩基配位子を含むMII−LnIII−MII三核錯体の完全自然分晶

    第62回錯体化学討論会  2012年 

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  • Complete Spontaneous Resolution of 3d–4f–3d Type Heterotrinuclear Complexes

    40th International Conference on Coordination Chemistry  2012年 

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  • Mononuclear and Dinuclear RhIII and IrIII Complexes Bearing 5-Methyltetrazolate

    40th International Conference on Coordination Chemistry  2012年 

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  • Chiral Tetradecanuclear Nickel(II) Cage Complex with Imidazole Containing Ligand

    40th International Conference on Coordination Chemistry  2012年 

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  • Preparation, Structures and Properties of Ru(II) Complexes with Hydrazone Ligand

    40th International Conference on Coordination Chemistry  2012年 

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  • Redox Properties of Ru (II/III) Complexes with 1,4,5,6-tetrahydropyrimidyl-2-phenolate

    40th International Conference on Coordination Chemistry  2012年 

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  • Cyclic Tetranuclear Rhodium(III) Complexes with Flexible Thyminate(2-) Bridges

    40th International Conference on Coordination Chemistry  2012年 

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  • Heterodimetallic Complexes Bridged by 5-(2-Diphenylphosphinoethyl) tetrazolate

    40th International Conference on Coordination Chemistry  2012年 

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  • ホスフィン−テトラゾラト型配位子を含む遷移金属錯体配位子を用いた異種金属二核錯体の合成と性質

    日本化学会第92春季年会  2012年 

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  • 非対称三座アミン−アミダト型配位子を用いたコバルト(III)錯体の幾何異性と分光化学的性質

    日本化学会第92春季年会  2012年 

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  • 遷移金属とランタノイドを含む三核錯体における完全自然分晶

    日本化学会第92春季年会  2012年 

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  • アデニナト(1-)およびチミナト(1-)が配位したロジウム(III)錯体の合成と構造および水素結合相互作用

    日本化学会第92春季年会  2012年 

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  • 三脚型六座配位子の Co(II) 錯体を錯体配位子として用いた三核錯体の合成と性質

    日本化学会第92春季年会  2012年 

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  • 遷移金属(II)イオンとランタニド(III)イオンを含む三核錯体の完全自然分晶

    錯体化学会第61回討論会  2011年 

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  • ビス−イミダゾリルイミン配位子を含む鉄(II)錯体の結晶構造と磁気的性質

    2011年日本化学会西日本大会  2011年 

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  • アミダトおよびチオエーテル供与基を持つ直鎖型六座配位子のコバルト(II)および(III)錯体の性質

    2011年日本化学会西日本大会  2011年 

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  • イミダゾール基を含むシッフ塩基配位子を用いた新規単核および多核錯体の合成と性質

    2011年日本化学会西日本大会  2011年 

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  • 8-(ジフェニルホスファニル)キノリンを含む遷移金属錯体の特異な立体構造の安定化

    日本化学会第91春季年会  2011年 

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  • Synthesis and Properties of Maganese(III, IV) Complexes with Amine-amidate Type Tridentate Ligand

    2011 Symposium on Coordination Compounds as Molecular Magnetic Materials  2011年 

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  • Linkage Isomerism of 5-Methyltetrazolato-Bridged Dinuclear Complexes

    2011 Symposium on Coordination Compounds as Molecular Magnetic Materials  2011年 

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  • Reactivity and Electronic State of Cobalt Complexes with Strand Type Ligands Containing Thiether-Amidato-Pyridyl Donor Sets

    2011 Symposium on Coordination Compounds as Molecular Magnetic Materials  2011年 

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  • 非対称三座アミン−アミダト配位子を用いたコバルト(III)錯体の幾何選択性と水素結合相互作用

    2011年日本化学会西日本大会  2011年 

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  • アミン−アミダト三座配位子を用いたマンガン(III,IV)錯体の合成と性質

    錯体分子素子研究センター「新規分子磁性化合物の探索」2011年シンポジウム  2011年 

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  • 5-メチルテトラゾラト架橋二核錯体の結合異性

    錯体分子素子研究センター「新規分子磁性化合物の探索」2011年シンポジウム  2011年 

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  • チオエーテル−アミダト−ピリジンドナーセットを持つ直鎖型六座配位子のコバルト錯体の反応性と電子状態

    錯体分子素子研究センター「新規分子磁性化合物の探索」2011年シンポジウム  2011年 

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  • R-、RS-1-フェニルエチルアミンと4-フォルミルイミダゾール脱水反応により生成する二座配位子のFe(II)錯体が示すキラル識別集積とスピン転移挙動

    錯体化学会第61回討論会  2011年 

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  • イミダゾール−塩化物イオン間の水素結合により生成するキュバン型四核鉄(II)錯体の段階的スピン転移とヒステリシス

    錯体化学会第61回討論会  2011年 

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  • イミダゾール含有二座キレート配位子によるfac-及びmer-型鉄(II)錯体の選択的合成とfac-型キュバン集積錯体のカウンターイオンによるスピン転移

    錯体化学会第61回討論会  2011年 

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  • 2-Methylimidazole-4-yl-methylideneaminopropylを配位子とするFe(II)スピンクロスオーバー錯体[FeII(HL)3]X,Y: 架橋ハロゲンイオンXと第二陰イオンYの効果

    錯体化学会第61回討論会  2011年 

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  • 核酸塩基thymineを構成ユニットとするCp*RhIII四核錯体の合成と構造

    錯体化学会第61回討論会  2011年 

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  • 三脚型三座ホスフィン配位子を有する七配位d4金属錯体の合成と構造および性質

    2011年日本化学会西日本大会  2011年 

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  • 8-(ジフェニルホスファニル)キノリンを含む八面体型金属錯体の合成と性質

    錯体分子素子研究センター「新規分子磁性化合物の探索」2011年シンポジウム  2011年 

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  • テトラゾラト基を含むシッフ塩基型多座配位子を有する金属錯体の合成

    錯体化学会第61回討論会  2011年 

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  • イミダゾール基を含むシッフ塩基配位子を用いた新規単核および多核錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • Unusual Redox Properties of Ruthenium(II/III) Complexes with Bidentate 1,4,5,6-Tetrahydropyrimidyl-2-phenol Ligand

    錯体化学会第61回討論会  2011年 

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  • ホスフィン−テトラゾラト型配位子が架橋した異種金属二核錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • イミダゾール基と2-ピリジルヒドラゾン部位を持つ非対称三座配位子を含むコバルト(II)錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • 8-(ジフェニルホスファニル)キノリンを含むロジウム(III)及びルテニウム(II)錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • イミダゾール基を有する配位子による新規かご形錯体の合成と性質

    日本化学会第91春季年会  2011年 

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  • 特異な構造および電子状態の安定化を可能にする三脚型三座ホスフィン配位子を有するd4金属錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • イミダゾラト架橋による14核かご型錯体の合成と性質

    錯体化学会第61回討論会  2011年 

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  • Encapsulated anion in a cubane-like tetranuclear spin crossover iron(II) complex

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Syntheses and properties of mononuclear manganese(II), -(III), and –(IV) complexes with a tripodal ligand

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Geometrical isomers of cobalt(III) complexes with unsymmetrical tridentate n-(alkylamino)salicylamidate ligands

    XVIIth International Winter School on Coordination Chemistry  2010年 

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  • Structures and properties of homo- and heterometal trinuclear complexes with tripodal N3O3 type Schiff base ligand

    XVIIth International Winter School on Coordination Chemistry  2010年 

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  • Cubane型構造をもつfac-型鉄(II)錯体 [Fe(HLBenzyl)3]Cl•Xの特異なスピンクロスオーバー挙動

    2010年日本化学会西日本大会  2010年 

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  • 鉄(II)錯体のキラル集積構造とヒステリシスを持つスピンクロスオーバー

    2010年日本化学会西日本大会  2010年 

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  • 2-メチル-4-ホルミルイミダゾールとN,N’-ビス(2-アミノエチル)-1,3-プロパンジアミンからなる六座配位子を用いた鉄(II)錯体のスピン転移と立体配座効果

    2010年日本化学会西日本大会  2010年 

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  • イミダゾラト架橋による新規かご型錯体の合成

    2010年日本化学会西日本大会  2010年 

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  • 三脚N3O3型6座配位子の単核および多核錯体の性質

    2010年日本化学会西日本大会  2010年 

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  • 三脚型6座Schiff塩基配位子を用いた面共有三核錯体の構造および磁気的性質

    錯体分子素子研究センター「新規分子時性化合物の探索」2010年シンポジウム  2010年 

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  • 2-メチル-4-フォルミルイミダゾールとモノアミンを配位子とする鉄(II)錯体の多様な集積構造とスピン転移現象

    第60回錯体化学討論会  2010年 

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  • イミダゾール基と塩化物イオン間の水素結合で構築されたキュウーバン型4核鉄(II)錯体の多段会スピン転移

    第60回錯体化学討論会  2010年 

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  • テトラゾラト誘導体を架橋配位子に用いた異種金属二核錯体の合成と性質

    第60回錯体化学討論会  2010年 

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  • ビスイミダゾリルイミン配位子を含む鉄(II)錯体の構造とスピンクロスオーバー挙動

    第60回錯体化学討論会  2010年 

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  • イミダゾール基を含む配位子による新規かご型錯体の合成

    第60回錯体化学討論会  2010年 

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  • 8-(ジフェニルホスフィノ)キノリンおよびその類縁配位子を含む遷移金属錯体の合成と立体構造

    第60回錯体化学討論会  2010年 

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  • イミダゾール基を含む非対称な四座シッフ塩基配位子を用いた遷移金属錯体の合成,構造および反応

    第60回錯体化学討論会  2010年 

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  • 特異な構造および電子状態の安定化を可能にする三脚状三座ホスフィン配位子を有するMo, W錯体の合成と性質

    第60回錯体化学討論会  2010年 

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  • アミダト供与基を含む直鎖型六座配位子のコバルト錯体に関する反応性と電子状態

    第60回錯体化学討論会  2010年 

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  • 5-メチルテトラゾラト架橋Ir–Rh二核錯体の結晶および溶存構造に与える共存配位子の影響

    第60回錯体化学討論会  2010年 

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  • Geometrical Isomers of Cobalt Complexes with Unsymmetrical Tridentate (Hydroxybenzamido)alkylamines

    60th Anniversary Conference on Coordination Chemistry in OSAKA, Japan  2010年 

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  • Stabilization of three different oxidation states of manganese by using a sole tripodal hexadentate Schiff base ligand

    60th Anniversary Conference on Coordination Chemistry in OSAKA, Japan  2010年 

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  • Geometrical Isomers of Cobalt(III) Complexes with Unsymmetrical Tridentate (Hydroxybenzamido)alkylamines

    2nd Okayama University – Copenhagen University collaboration symposium  2010年 

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  • Cobalt Complexes with a Strand Type Hexadentate Ligand Containing Thioether-amidate-pyridyl Donor Set

    2nd Okayama University – Copenhagen University collaboration symposium  2010年 

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  • Crystal Structures and Isomerization Reactions of Dinuclear Ir–Rh Complexes Bridged by 5-Methyltetrazolate

    2nd Okayama University – Copenhagen University collaboration symposium  2010年 

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  • Chiral Recognition using Hydrogen Bonding Framework of Metal Complexes with Tripodal Ligand Containing Imidazole Groups

    2nd Okayama University – Copenhagen University collaboration symposium  2010年 

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  • 5-メチルテトラゾラト架橋Ir–Rh二核錯体の結晶構造及び異性化反応

    日本化学会第90春季年会  2010年 

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  • Geometrical isomers of cobalt(III) complexes with unsymmetrical tridentate (hydroxybenzamido)alkylamines

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Synthesis of 14-nuclear coordination cage compounds using imidazole-derived ligands

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Structures and magnetic property of seven-coordinate molybdenum(II) complexes containing 1,1,1-tris(dimethylphosphinomethyl)ethane

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Reactivity between metal complexes bearing imidazole group and tetraphenylborate ion

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Synthesis and reaction of ruthenium(II) azido complexes bearing 2-pyridinethiolate

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Crystal structures and isomerization reactions of dinuclear Ir(III)–Rh(III) complexes bridged by 5-methyltetrazolate

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • Cobalt complexes with a linear chain type hexadentate ligand containing amidate and thioether groups

    2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010)  2010年 

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  • 三脚型配位子を用いた単核マンガン(II), (III), (IV)錯体の合成と性質

    第59回錯体化学討論会  2009年 

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  • Nitronyl Nitroxide Radicalを用いたMnIIIシッフ塩基錯体の合成と構造及び磁気的性質

    第59回錯体化学討論会  2009年 

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  • アミド基を有する直鎖型六座配位子を用いたコバルト(II/III)錯体の合成と性質

    第59回錯体化学討論会  2009年 

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  • 非対称型三座アミドまたはシッフ塩基配位子を用いた金属錯体の合成とその構造および性質

    第59回錯体化学討論会  2009年 

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  • 2-シアノエチルホスフィン類を含むCo(III)錯体の構造、性質および反応:テトラゾラト/ホスフィン型キレート錯体の生成

    第59回錯体化学討論会  2009年 

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  • 四座シッフ塩基配位子のマンガン(III)錯体にニトロニルニトロキシドラジカルが配位した新奇マンガン(III)錯体の構造と性質

    第58回錯体化学討論会  2008年 

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  • STRUCTURES AND MAGNETIC PROPERTIES OF MANGANESE(III) COMPLEXES WITH NITRONYL NITROXIDES

    XVIth International Winter School on Coordination Chemistry  2008年 

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  • SYNTHESIS AND PROPERTIES OF MANGANESE(II), -(III), and -(IV) COMPLEXES WITH A TRIPODAL LIGAND

    XVIth International Winter School on Coordination Chemistry  2008年 

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  • STRUCTURES AND SPIN STATES OF MONO- AND DINUCLEAR IRON(II) COMPLEXES WITH BIS-IMIDAZOLYLIMINE LIGANDS

    XVIth International Winter School on Coordination Chemistry  2008年 

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  • アミド窒素を配位元素とするN2O2 型平面四座配位子を用いたCo(III)、Rh(III)錯体の合成と性質

    第58回錯体化学討論会  2008年 

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  • アミド基を有する新規三脚型六座配位子を用いた三価金属錯体の合成と性質

    第58回錯体化学討論会  2008年 

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  • メチル置換イミダゾール基を含む三脚型配位子を用いた鉄(III)錯体の合成と性質

    第58回錯体化学討論会  2008年 

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  • 非対称三座配位子を用いた鉄(II)錯体の合成と性質

    第58回錯体化学討論会  2008年 

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  • 三脚型配位子を用いたマンガン(II),(III),(IV)錯体の合成と性質

    第58回錯体化学討論会  2008年 

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  • azine系配位子を含む単核コバルト(III)錯体の合成と性質

    2007年日本化学会西日本大会  2007年 

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  • Synthesis, Crystal Structures and Properties of Carboxylate Bridged Mn(III) Dimers with Tetradentate Schiff Base Ligand

    1st Asian Conference on Coordination Chemistry  2007年 

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  • 三脚型アミド配位子を用いた高酸化数金属錯体の合成と性質

    2007年日本化学会西日本大会  2007年 

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  • 常磁性Co(III)錯体を錯体配位子とする多核金属錯体の合成と性質

    2007年日本化学会西日本大会  2007年 

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  • 非対称三座配位子を用いた鉄(II)錯体の合成と性質

    2007年日本化学会西日本大会  2007年 

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  • 自己集合に基づく金属錯体の自然分晶とキラル認識

    第57回錯体化学討論会  2007年 

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  • サレンマンガン(III)二量体のカルボキシレート架橋一次元錯体の構造と性質

    2007年日本化学会西日本大会  2007年 

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  • カルボキシレート架橋したサレンマンガン(III)二量体[{Mn(salen)}2(RCOO)]nXnの構造と性質

    第57回錯体化学討論会  2007年 

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  • スピンクロスオーバー挙動を示す二核の鉄(II)錯体の合成と性質

    第57回錯体化学討論会  2007年 

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  • 三脚型配位子を含む3d-4f系多核錯体の構造制御に基づく単分子磁性体の構築

    第57回錯体化学討論会  2007年 

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  • [Mn(salen)]+誘導体とニトロニルニトロキシドラジカルから成る一次元化合物の合成とその構造および磁性

    第57回錯体化学討論会  2007年 

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  • シアノ架橋したサレン-マンガン(III)錯体の合成と磁気挙動

    第56回錯体化学討論会  2006年 

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  • Di-2-pyrimidinecarboxamidato錯体を錯体配位子とする多核錯体の合成と性質

    第56回錯体化学討論会  2006年 

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  • ビス-イミダゾリルイミン配位子を含む単核および2核錯体の構造と磁気的性質

    第56回錯体化学討論会  2006年 

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  • 自己集合に基づく金属錯体のキラル認識と自然分晶

    第56回錯体化学討論会  2006年 

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  • 三脚型配位子の鉄(III)錯体の合成、構造とスピンクロスオーバー

    第56回錯体化学討論会  2006年 

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  • バナジウム―ランタノイド4核錯体の合成と性質

    第56回錯体化学討論会  2006年 

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  • 三脚型六座配位子を用いた同種・異種金属三核錯体の構造と磁気的性質

    第56回錯体化学討論会  2006年 

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  • 三脚型配位子を含む第一遷移金属―希土類金属系多核錯体の合成、構造および磁気的性質

    第56回錯体化学討論会  2006年 

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  • Thermotropic liquid-crystalline behavior of oxovanadium(IV) complexes with chiral ligands

    20th International Conference on Coordinetion and Bioinorganic Chemistry  2005年 

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  • バナジウム-セリウム三核錯体の合成と性質

    第55回錯体化学討論会  2005年 

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  • シアノ架橋[Mn(salen))]+誘導体の合成と磁性

    第55回錯体化学討論会  2005年 

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  • 三脚型配位子を含む3d-4f系多核錯体の合成、構造および磁気的性質

    第55回錯体化学討論会  2005年 

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  • 自己集合に基づくCo(III)錯体の不斉認識と自然分晶

    第55回錯体化学討論会  2005年 

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  • 三脚型六座配位子を用いたNi-M-Ni型異種金属三核錯体の構造と磁気的性質

    第55回錯体化学討論会  2005年 

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  • クロム錯体を錯体配位子とした混合金属錯体系の構築

    第55回錯体化学討論会  2005年 

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  • オキソバナジウム(IV)錯体の液晶性および選択反射

    第55回錯体化学討論会  2005年 

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  • Syntheses, structures and magnetic properties of complexes with NiLn, NiLnNi, and NiLnLnNi cores supported by tripodal ligands (Ln = Eu, Gd, Tb, Dy)

    20th International Conference on Coordinetion and Bioinorganic Chemistry  2005年 

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  • Magnetic propreties of cyano-bridged [Mn(salen)]+ derivatives

    20th International Conference on Coordinetion and Bioinorganic Chemistry  2005年 

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  • Structures and magnetic properties of heterometal complexes with tripodal hexadentate ligands

    20th International Conference on Coordinetion and Bioinorganic Chemistry  2005年 

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  • 三脚型六座配位子を用いたNi(II)-M(II)-Ni(II)異種金属多核錯体の合成と性質

    第54回錯体化学討論会  2004年 

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  • Syntheses of copper(II)-lanthanoid(III) polynuclear complexes using a dianionic Cu(II) ligand-complex and their magnetic properties

    XIVth Winter School on Coordination Chemistry  2004年 

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  • Structures and magnetic properties of 3d-4f complexes with tripodal ligands

    XIVth Winter School on Coordination Chemistry  2004年 

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  • Iron complexes with a tripodal ligand containing three imidazole groups: proton-coupled electron transfer reactions and spin crossover behaviors

    XIVth Winter School on Coordination Chemistry  2004年 

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  • Ferromagnetic NiII-LnIII interactions in complexes with NiLn, NiLnNi, and NiLnLnNi cores supported by tripodal ligands

    IXth International Conference on Molecule-based Magnets (ICMM2004)  2004年 

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  • Novel copper(II)-lanthanoid(III) polynuclear complexes using a dianionic Cu(II) ligand-complex

    IXth International Conference on Molecule-based Magnets (ICMM2004)  2004年 

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  • Spin crossover behaviors of FeII, FeIII, and FeII-FeII complexes with tropodal ligand containing three imidazole groups

    IXth International Conference on Molecule-based Magnets (ICMM2004)  2004年 

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  • M&ouml;ssbauer spectroscopic studies of mixed-valence spin-crossover complexes

    IXth International Conference on Molecule-based Magnets (ICMM2004)  2004年 

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  • 三脚型イミダゾール配位子を持つ単核錯体のメスバウアースペクトル

    第54回錯体化学討論会  2004年 

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  • 三脚型配位子のNi(II)錯体を錯体配位子とした3d-4f系多核錯体の合成と性質

    第54回錯体化学討論会  2004年 

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  • イミダゾール基を持つ三脚型Schiff塩基配位子の鉄錯体のスピンクロスオーバー

    第54回錯体化学討論会  2004年 

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  • キラルなサリチルアルジミン配位子をもつ金属錯体の液晶性

    第54回錯体化学討論会  2004年 

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  • イミダゾール基を含む三脚型配位子を用いたFe(III)錯体の構造とスピンクロスオーバー挙動

    第 53 回錯体化学討論会  2003年 

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  • 二次元スピンクロスオーバー鉄(II)錯体の層間相互作用

    第 53 回錯体化学討論会  2003年 

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  • アミド配位子を用いたMn(III)-Ln(III)多核錯体の合成と磁性

    第 53 回錯体化学討論会  2003年 

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  • 三脚型シッフ塩基配位子を有する鉄(II)錯体の磁気的および分光学的性質

    第 53 回錯体化学討論会  2003年 

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  • イミダゾール/イミダゾレート架橋構造を持つ二次元鉄錯体のメスバウアースペクトル

    第 53 回錯体化学討論会  2003年 

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  • 三脚型配位子を用いたNi(II)-Ln(III)異種金属多核錯体の合成と性質

    第 53 回錯体化学討論会  2003年 

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  • 多様なスピン変換過程をもつ二次元錯体のスピンクロスオーバーとLIESST

    第52回錯体化学討論会  2002年 

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  • Fe(II)-Fe(III)混合原子価スピンクロスオーバー錯体のメスバウアースペクトル

    第 52 回錯体化学討論会  2002年 

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  • 混合原子価水素結合二次元錯体[FeII(H3L)][FeIII(L)](NO3)2とその関連化合物のスピンクロスオーバーならびにLIESST挙動

    第52回錯体化学討論会  2002年 

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  • 三層構造を持つ混合原子価鉄錯体のスピンクロスオーバー挙動

    第52回錯体化学討論会  2002年 

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  • 新奇マンガン(III)-ガドリニウム(III)錯体の合成と磁性

    第 51 回錯体化学討論会  2001年 

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  • 混合原子価鉄錯体のキラル2次元構造とスピンクロスオーバー

    第 51 回錯体化学討論会  2001年 

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  • 三脚型配位子を含む鉄(II)錯体の合成と構造および磁気的性質

    第 51 回錯体化学討論会  2001年 

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  • d-f環状四核錯体の合成、構造、磁性

    第 51 回錯体化学討論会  2001年 

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  • イミダゾール基を二つ含む三座配位子のコバルト(III)錯体の合成と自然分晶

    第 51 回錯体化学討論会  2001年 

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  • イミダゾール基を含む三脚型鉄(II)、(III)錯体のスピン平衡と脱プロトン挙動

    第 50 回錯体化学討論会  2000年 

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  • 非等価型銅錯体を錯体配位子とする銅-ガドリニウム錯体の合成と磁性

    日本化学会九州支部・同中国四国支部合同大会  2000年 

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  • 三脚型金属(II)錯体のラセミ混合物における結晶系、絶対配置、CDパターンの関係

    日本化学会九州支部・同中国四国支部合同大会  2000年 

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  • 三脚型鉄(II)、(III)錯体のイミダゾールプロトンの脱離による電子状態の変化

    日本化学会九州支部・同中国四国支部合同大会  2000年 

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  • 自然分晶する三脚型金属錯体の結晶型、絶対配置、CDパターンの関係

    第 50 回錯体化学討論会  2000年 

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▼全件表示

共同研究・競争的資金等の研究

  • 二核鉄(II)三重らせん錯体に基づく三次元水素結合集積化錯体系の構築とその応用

    研究課題/領域番号:15K05455  2015年04月 - 2018年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    砂月 幸成, 鈴木 孝義, 小島 正明

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    配分額:4940000円 ( 直接経費:3800000円 、 間接経費:1140000円 )

    キラル識別と分子センサーへの応用を目指した三重らせん型二核鉄(II)錯体の部分的脱プロトン化による水素結合三次元集積体の合成を試みた。目的は現在までのところ達成できていないが、代わりにケージ型錯体に発展可能な四面体型分子を得た。また関連配位子の鉄(II)単核錯体の温度掃引速度に依存したスピンクロスオーバー挙動が、固体中での遅い置換基の配向変化によるものであることを明らかにした。

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  • 可逆的に分解―再構築が可能な分子ケージの創出とその機能に関する研究

    研究課題/領域番号:23550078  2011年 - 2013年

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    砂月 幸成

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    配分額:5200000円 ( 直接経費:4000000円 、 間接経費:1200000円 )

    イミダゾール基を含むシッフ塩基配位子を用いて14核ニッケル(II)錯体を合成した。この錯体は立方体の頂点の位置に8個、面の中央に6個のニッケルイオンを含み、これらが脱プロトン化した配位子のイミダゾレート基で架橋されている、分子内部に空孔を有する分子である。この錯体は空孔内部に窒素原子を含むヘキサメチレンテトラミンを取り込むことができ、よく似た構造を持ち窒素原子を含まないアダマンタンを取り込むことはできなかった。この挙動の違いから14核錯体は弱い配位結合相互作用が可能な分子を取り込むことができることを明らかにした。

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  • 光スイッチング分子素子となる水素結合による二次元スピンクロスオーバー鉄錯体

    研究課題/領域番号:02J05859  2002年 - 2004年

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    砂月 幸成

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    配分額:1500000円 ( 直接経費:1500000円 )

    イミダゾール基を含む三脚型配位子の鉄錯体[Fe^<II>H_3L]^<2+>の硝酸塩に1.5等量のアルカリを加え、組成式[Fe^<II>H_3L][Fe^<III>L](NO_3)_2をもつ化合物を得た。このものは、原料の2価プロトン化錯体[Fe^<II>H_3L](NO_3)_2と、イミダゾールプロトンがすべて解離し、さらに空気酸化された3価脱プロトン化錯体[Fe^<III>L]が水素結合により連結した二次元層状構造をもつことを、295Kおよび100KにおけるX線結晶解析により明らかにした。二つの温度での結合拒離の違いからこの化合物は鉄(II)サイトがスピンクロスオーバーを示すことが示唆された。磁化率の温度変化の測定から、この化合物はサンプルを急冷すると5〜100Kの温度範囲で凍結効果を示し、引き続いて100〜200Kの温度範囲で鉄(II)サイトが二段階でスピンクロスオーバーし、サンプルを徐々に冷却した場合には160K付近で鉄(II)サイトが一段階での急激なスピンクロスオーバーを示すことが明らかになった。また200K以上の温度範囲では鉄(III)サイトの緩やかなスピンクロスオーバー挙動が観測された。この挙動はメスバウアースペクトル、ESRスペクトルの測定からも確認された。また、5Kにおいてサンプルに500nmの光を照射すると磁化の増大が観測され、光誘起スピン励起状態トラッピング(LIESST)現象が観測された。この光誘起スピン励起状態は80〜100Kの温度範囲で急速に熱緩和された。また、この化合物はCDスペクトルを示し、自然分晶していることも明らかになった。
    以上の結果は、Angewandte Chemieに投稿し、まもなく掲載される予定である。また、BF_4塩の系について、原料錯体などの関連化合物の性質も含めたFull paperの論文を投稿準備中である。

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