研究者詳細 - 田嶋　智之

論文 - 田嶋　智之

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Intra- and intermolecular photochemical properties of poly(amidoamine) dendrons with an anthracene at focal point 査読

M Fujitsuka, O Ito, Y Takaguchi, T Tajima, K Ohta, J Motoyoshiya, H Aoyama

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 76 ( 4 ) 743 - 747 2003年4月

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

Photophysical and photochemical properties of poly(amidoamine) dendrons containing an anthracene at the focal point have been studied by the steady-state and transient spectroscopic methods in solution. The fluorescence lifetime of the anthracene moiety in the higher generation dendron (G3.5) is slightly shorter than that of the lower generation homologue (G0.5). On the other hand. the triplet lifetime of G3.5 is longer than that of G0.5. The bimolecular rate constants for energy transfer from the triplet states of the anthracene moiety to O-2 (k(O2)) and for T-T annihilation (k(TT)) were almost the same for the anthryl dendrons, G3.5 and G0.5, suggesting that the dendron groups do not hinder the approach of O-2 or the anthracene moiety. Photodimerization of G3.5 took place at a similar rate to G0.5. while the photodissociation rates of these anthracene dimers increase in the order of anthracene > G0.5 > G3.5, suggesting the presence of some attractive forces between dendron wedges.

DOI： 10.1246/bcsj.76.743

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The first examples of stable benzenes fused with two three-membered rings: Synthesis and structures of the two stereoisomers of bis(silacyclopropa)benzenes 査読

T Tajima, K Hatano, T Sasaki, T Sasamori, N Takeda, N Tokitoh

CHEMISTRY LETTERS 32 ( 3 ) 220 - 221 2003年3月

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

Two stereoisomers of the first stable bis(silacyclopropa)benzenes (1a, 1b) were successfully synthesized by the reaction of Tbt(Dip)SiLi2 (3) [Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dip = 2,6-diisopropylphenyl] with 1,2,4,5-tetrabromobenzene. The molecular structures of 1a and 1b were discussed on the basis of the X-ray structural analyses.

DOI： 10.1246/cl.2003.220

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Photodimerization of anthracene having dendritic substituent within the vaterite crystal of CaCO3 査読

Y Takaguchi, Y Yanagimoto, T Tajima, K Ohta, J Motoyoshiya, H Aoyama

CHEMISTRY LETTERS ( 11 ) 1102 - 1103 2002年11月

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

Crystallization of CaCO3 in the presence of poly(amidoamine) (PAMAM) dendron containing an anthryl group at the focal point and carboxylate groups at the external surface resulted in the formation of spherical vaterite crystals. Furthermore, photodimerization reaction of anthracene unit proceeded within the vaterite crystals upon irradiation.

DOI： 10.1246/cl.2002.1102

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Reversible binding of C-60 to an anthracene bearing a dendritic poly(amidoamine) substituent to give a water-soluble fullerodendrimer 査読

Y Takaguchi, T Tajima, K Ohta, J Motoyoshiya, H Aoyama, T Wakahara, T Akasaka, M Fujitsuka, O Ito

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 41 ( 5 ) 817 - + 2002年

Reversible binding of C-60 to an anthracene bearing a dendritic poly(amidoamine) substituent to give a water-soluble fullerodendrimer 査読国際誌

Y Takaguchi, T Tajima, K Ohta, J Motoyoshiya, H Aoyama, T Wakahara, T Akasaka, M Fujitsuka, O Ito

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 41 ( 5 ) 817 - + 2002年

2PB35 アントラセンをコアに持つ新規デンドリマー型液晶性分子の合成と性質

高口豊, 田嶋智之, 太田和親, 本吉谷二郎, 青山弘

日本液晶学会討論会講演予稿集 2001 479 - 480 2001年

記述言語：日本語出版者・発行元：日本液晶学会

As a class of new materials, dendrimers have, in recent years, generated a great deal of interest within the scientific community. In particular, there is an increasing focus on developing applications for photoresponsive dendrimers. Recently, we have described dechalcogenation reaction of dendrimer dichalcogenides upon irradiation and a new photoreactive anthracenyl dendron undergoes a reversible photocyclization to form a dendrimer.^<1,2> Interestingly, a poly(amide amine) dendron having anthracene at the focal point undergoes reversible photodimerization within it's liquid-crystalline state. Investigation of thermal behavior of the LC dendron by means of polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction experiments reveals smectic-type mesophase.

DOI： 10.11538/ekitou.2001.0_479

Photoresponsive dendrimers: Syntheses and characterizations of anthracenes bearing dendritic substituents 査読

Y Takaguchi, T Tajima, K Ohta, J Motoyoshiya, H Aoyama

CHEMISTRY LETTERS ( 12 ) 1388 - 1389 2000年12月

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