Faculty Profiles - SUZUKI Takayoshi

Papers - SUZUKI Takayoshi

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Strongly Oxidizing Thiapyrylium Salt for Organophotoredox Catalysis

Mohamed R. El-kholany, Takeru Senoo, Asuka Mizutani, Hiroyoshi Takamura, Takayoshi Suzuki, Isao Kadota, Kenta Tanaka

Organic Letters 2025.5

Conformational Flexibility of D1-Glu189: A Crucial Determinant in Substrate Water Selection, Positioning, and Stabilization within the Oxygen-Evolving Complex of Photosystem II

Hiroshi Isobe, Takayoshi Suzuki, Michihiro Suga, Jian-Ren Shen, Kizashi Yamaguchi

ACS Omega 2024.12

Synthesis and characterization of iron(II) complex with unsymmetrical heterocyclic (2-pyridyl)(4-imidazolyl)azine

Kennedy Mawunya Hayibor, Yukinari Sunatsuki, Takayoshi Suzuki

Inorganica Chimica Acta 564 121937 - 121937 2024.5

The effect of solvent molecules on crystallisation of heterotrinuclear M^II–Tb^III–M^II complexes with tripodal nonadentate ligands

Kazuma Takahara, Yuki Horino, Koki Wada, Hiromu Sakata, Daichi Tomita, Yukinari Sunatsuki, Hiroshi Isobe, Masaaki Kojima, Takayoshi Suzuki

CrystEngComm 26 ( 7 ) 1004 - 1014 2024

Crystallization Behavior of Heterotrinuclear Zn^II–Ln^III–Zn^II Complexes Bearing Two Tripodal Nonadentate Ligands: Possibility for Absolute Spontaneous Resolution

Kazuma Takahara, Yuki Horino, Koki Wada, Hiromu Sakata, Yukinari Sunatsuki, Masaaki Kojima, Takayoshi Suzuki

Crystal Growth & Design 23 ( 7 ) 5244 - 5256 2023.6

Structural comparison of geometrical isomers of N'-(1H-imidazol-4-ylmethylene)picolinohydrazide and their mononuclear and dinuclear cobalt(III) complexes

Daniel K.B. Acheampong, Yukinari Sunatsuki, Takayoshi Suzuki

Results in Chemistry 5 100798 - 100798 2023.1

Selective Formation of Unsymmetric Multidentate Azine-Based Ligands in Nickel(II) Complexes

Kennedy Mawunya Hayibor, Yukinari Sunatsuki, Takayoshi Suzuki

MOLECULES 27 ( 20 ) 2022.10

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI

A mixture of 2-pyridine carboxaldehyde, 4-formylimidazole (or 2-methyl-4-formylimidazole), and NiCl2 center dot 6H(2)O in a molar ratio of 2:2:1 was reacted with two equivalents of hydrazine monohydrate in methanol, followed by the addition of aqueous NH4PF6 solution, afforded a Ni-II complex with two unsymmetric azine-based ligands, [Ni(HLH)(2)](PF6)(2) (1) or [Ni(HLMe)(2)](PF6)(2) (2), in a high yield, where HLH denotes 2-pyridylmethylidenehydrazono-(4-imidazolyl)methane and HLMe is its 2-methyl-4-imidazolyl derivative. The spectroscopic measurements and elemental analysis confirmed the phase purity of the bulk products, and the single-crystal X-ray analysis revealed the molecular and crystal structures of the Ni-II complexes bearing an unsymmetric HLH or HLMe azines in a tridentate kappa(3) N, N', N" coordination mode. The HLH complex with a methanol solvent, 1 center dot MeOH, crystallizes in the orthorhombic non-centrosymmetric space group P2(1)2(1)2(1) with Z = 4, affording conglomerate crystals, while the HLMe complex, 2 center dot H2O center dot Et2O, crystallizes in the monoclinic and centrosymmetric space group P2(1)/n with Z = 4. In the crystal of 2 center dot H2O center dot Et2O, there is intermolecular hydrogen-bonding interaction between the imidazole N-H and the neighboring uncoordinated azine-N atom, forming a one-dimensional polymeric structure, but there is no obvious magnetic interaction among the intra- and interchain paramagnetic Ni-II ions.

DOI： 10.3390/molecules27206788

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Roles of the Flexible Primary Coordination Sphere of the Mn4CaOx Cluster: What Are the Immediate Decay Products of the S3 State? International journal

Hiroshi Isobe, Mitsuo Shoji, Takayoshi Suzuki, Jian-Ren Shen, Kizashi Yamaguchi

The journal of physical chemistry. B 126 ( 38 ) 7212 - 7228 2022.9

Language：English Publishing type：Research paper (scientific journal)

The primary coordination sphere of the multinuclear cofactor (Mn4CaOx) in the oxygen-evolving complex (OEC) of photosystem II is absolutely conserved to maintain its structure and function. Recent time-resolved serial femtosecond crystallography identified large reorganization of the primary coordination sphere in the S2 to S3 transition, which elicits a cascade of events involving Mn oxidation and water molecule binding to a putative catalytic Mn site. We examined how the crystallographic fields, created by transient conformational states of the OEC at various time points, affect the thermodynamics of various isomers of the Mn cluster using DFT calculations, with an aim of comprehending the functional roles of the flexible primary coordination sphere in the S2 to S3 transition and in the recovery of the S2 state. The results show that the relative movements of surrounding residues change the size and shape of the cavity of the cluster and thereby affect the thermodynamics of various catalytic intermediates as well as the ability to capture a new water molecule at a coordinatively unsaturated site. The implication of these findings is that the protein dynamics may serve to gate the catalytic reaction efficiently by controlling the sequence of Mn oxidation/reduction and water binding/release. This interpretation is consistent with EPR experiments; g ∼ 5 and g ∼ 3 signals obtained after near-infrared (NIR) excitation of the S3 state at 4 K and a g ∼ 5 only signal produced after prolonged incubation of the S3 state at 77 K can be best explained as originating from water-bound S2 clusters (Stotal = 7/2) under a S3 ligand field, i.e., the immediate one-electron reduction products of the oxyl-oxo (Stotal = 6) and hydroxo-oxo (Stotal = 3) species in the S3 state.

DOI： 10.1021/acs.jpcb.2c02596

PubMed

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Selective Formation of Intramolecular Hydrogen-Bonding Palladium(II) Complexes with Nucleosides Using Unsymmetrical Tridentate Ligands

Ryoji Mitsuhashi, Yuya Imai, Takayoshi Suzuki, Yoshihito Hayashi

Molecules 27 ( 7 ) 2098 - 2098 2022.3

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 2022.1

Language：English Publishing type：Research paper (scientific journal) Publisher：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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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 2021.9

Language：English Publishing type：Research paper (scientific journal) Publisher：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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Crystal and molecular structures of dichloridopalladium(II) containing 2-methyl- or 2-phenyl-8-(diphenyphosphanyl)quinoline

Masatoshi Mori, Atsushi Namioka, Takayoshi Suzuki

Acta Crystallographica Section E Crystallographic Communications 77 ( 1 ) 52 - 57 2021.1

Exploring reaction pathways for the structural rearrangements of the Mn cluster induced by water binding in the S3 state of the oxygen evolving complex of photosystem II

Hiroshi Isobe, Mitsuo Shoji, Takayoshi Suzuki, Jian-Ren Shen, Kizashi Yamaguchi

Journal of Photochemistry and Photobiology A: Chemistry 405 112905 - 112905 2021.1

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

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

RSC Advances 10 ( 71 ) 43472 - 43479 2020.12

Language：English Publishing type：Research paper (scientific journal) Publisher：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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Comparison of molecular structures of cis-bis[8-(dimethylphosphanyl)quinoline]nickel(II) and -platinum(II) complex cations Reviewed

Masatoshi Mori, Takayoshi Suzuki

Acta Crystallographica Section E Crystallographic Communications 76 ( 12 ) 1813 - 1817 2020.12

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

Masatoshi Mori, Yukinari Sunatsuki, Takayoshi Suzuki

Inorganic Chemistry 59 ( 24 ) 18255 - 18240 2020.12

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

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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Concomitant emergence of circularly polarized luminescence and single-molecule magnet behavior in chiral-at-metal Dy complex Reviewed

Bahjat El Rez, Jiawen Liu, Virginie Béreau, Carine Duhayon, Yuki Horino, Takayoshi Suzuki, Laurent Coolen, Jean-Pascal Sutter

Inorganic Chemistry Frontiers 7 4527 - 4534 2020.11

Mixed-ligand platinum(II) complexes containing 2-(2’-pyridyl)phenyl and 8-quinolylphosphines: synthesis and molecular structures in the crystals and in solution Reviewed

Mori, M.; Suzuki, T.

Inorganica Chimica Acta 512 119862 2020.11

A specific formation of an iridium(III) hydrido complex bearing 8-(diphenylphosphino)quinoline Reviewed

Ariyoshi, K., Kotera, M., Namioka, A., Suzuki, T.

Polyhedron, Journal of Inorganic and Nuclear Chemistry 179 114401 2020.3

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

Tsubasa Tanaka, Yukinari Sunatsuki, Takayoshi Suzuki

INORGANICA CHIMICA ACTA 502 119373 2020.3

Language：English Publishing type：Research paper (scientific journal) Publisher：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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Papers - SUZUKI Takayoshi