研究者詳細 - 山口　茂弘

論文 - 山口　茂弘

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Photodissociation of B-N Lewis Adducts: A Partially Fused Trinaphthylborane with Dual Fluorescence 査読有り

Matsuo Kyohei, Saito Shohei, Yamaguchi Shigehiro

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136 巻 ( 36 ) 頁： 12580 - 12583 2014年9月

Dearomatization-Induced Transannular Cyclization: Synthesis of Electron-Accepting Thiophene-S,S-Dioxide-Fused Biphenylene 査読有り

Fukazawa Aiko, Oshima Hiroya, Shimizu Soji, Kobayashi Nagao, Yamaguchi Shigehiro

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136 巻 ( 24 ) 頁： 8738 - 8745 2014年6月

A Strap Strategy for Construction of an Excited-State Intramolecular Proton Transfer (ESIPT) System with Dual Fluorescence 査読有り

N. Suzuki, A. Fukazawa, K. Nagura, S. Saito, H. Kitoh-Nishioka, D. Yokogawa, S. Irle, S. Yamaguchi

Angew. Chem. Int. Ed. 53 巻頁： 8231-8235 2014年6月

A Strap Strategy for Construction of an Excited-State Intramolecular Proton Transfer (ESIPT) System with Dual Fluorescence 査読有り

N. Suzuki, A. Fukazawa, K. Nagura, S. Saito, H. Kitoh-Nishioka, D. Yokogawa, S. Irle, S. Yamaguchi

Angew. Chem. Int. Ed. 53 巻頁： 8231-8235 2014年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

発光特性は，最も魅力的な有機化合物の「機能」の一つである．種々の発光現象の中でも，励起状態における分子内プロトン移動（excited-state intramolecular proton transfer, ESIPT）に起因する発光は，異常に大きなストークスシフトや，幅広い発光波長が実現できることから興味深く，白色発光材料や蛍光プロープへの応用の可能性が示されつつある．一方で，従来のESIPT 活性な有機色素の分子設計は，ほとんどが励起状態でのケト–エノール互変異性に基づくものに限られていた．これに対し本研究では，水素結合供与能をもつ含ピロールπ電子系に対し，水素結合受容能をもつ窒素原子を柔軟なアルキル鎖でくくりつける，すなわち「励起状態を制御するための機能性ストラップの導入」という斬新な分子設計により，新たな ESIPT 色素の開発に成功した．この化合物は，励起状態においてプロトン移動前とプロトン移動後の２つの準安定な構造をもち，各々から異なる波長で蛍光を示すことによ

Dearomatization-Induced Transannular Cyliczation: Synthesis of Electron-Accepting Thiophene-S,S-Dioxide-Fused Biphenylene 査読有り

A. Fukazawa, H. Oshima, S. Shimizu, N. Kobayashi, and S. Yamaguchi

J. Am. Chem. Soc. 136 巻頁： 8738-8745 2014年6月

Heterotriangulenes pi-Expanded at Bridging Positions 査読有り

Chou Chih-Ming, Saito Shohei, Yamaguchi Shigehiro

ORGANIC LETTERS 16 巻 ( 11 ) 頁： 2868 - 2871 2014年6月

The B(C6F5)(3) Boron Lewis Acid Route to Arene-Annulated Pentalenes 査読有り

Chen Chao, Harhausen Marcel, Fukazawa Aiko, Yamaguchi Shigehiro, Froehlich Roland, Daniliuc Constantin G., Petersen Jeffrey L., Kehr Gerald, Erker Gerhard

CHEMISTRY-AN ASIAN JOURNAL 9 巻 ( 6 ) 頁： 1671 - 1681 2014年6月

Heterotriangulenes π-Expanded at Bridging Positions 査読有り

C. -M. Chou, S. Saito, S. Yamaguchi

Org. Lett. 16 巻頁： 2868-2871 2014年5月

Synthesis of Pyridine N-Oxide-BF2CF3 Complexes and Their Fluorescence Properties 査読有り

Nishida Tomoaki, Fukazawa Aiko, Yamaguchi Eriko, Oshima Hiroya, Yamaguchi Shigehiro, Kanai Motomu, Kuninobu Yoichiro

CHEMISTRY-AN ASIAN JOURNAL 9 巻 ( 4 ) 頁： 1026 - 1030 2014年4月

Hybridization of a Flexible Cyclooctatetraene Core and Rigid Aceneimide Wings for Multiluminescent Flapping pi Systems 査読有り

Yuan Chunxue, Saito Shohei, Camacho Cristopher, Kowalczyk Tim, Irle Stephan, Yamaguchi Shigehiro

CHEMISTRY-A EUROPEAN JOURNAL 20 巻 ( 8 ) 頁： 2193 - 2200 2014年2月

Hydroxyphenyl-Substituted Benzophosphole Oxides: Impact of the Intramolecular Hydrogen Bond on the Fluorescence Properties

Fukazawa Aiko, Osaki Hiroshi, Yamaguchi Shigehiro

ASIAN JOURNAL OF ORGANIC CHEMISTRY 3 巻 ( 2 ) 頁： 122 - 127 2014年2月

Hydroxyphenyl-Substituted Benzophosphole Oxides: Impact of the Intramolecular Hydrogen Bond on the Fluorescence Properties 査読有り

Aiko Fukazawa, Hiroshi Osaki, Shigehiro Yamaguchi

ASIAN JOURNAL OF ORGANIC CHEMISTRY 3 巻 ( 2 ) 頁： 122 - 127 2014年2月

COD ID: 4120128 査読有り

Nagura Kazuhiko, Saito Shohei, Yusa Hitoshi, Yamawaki Hiroshi, Fujihisa Hiroshi, Sato Hiroyasu, Shimoikeda Yuichi, Yamaguchi Shigehiro

Crystallography Open Database 2014年

Constraint-induced structural deformation of planarized triphenylboranes in the excited state 査読有り

Tomokatsu Kushida, Cristopher Camacho, Ayumi Shuto, Stephan Irle, Masayasu Muramatsu, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa, Hiroshi Miyasaka, Eri Sakuda, Noboru Kitamura, Zhiguo Zhou, Atsushi Wakamiya, Shigehiro Yamaguchi

CHEMICAL SCIENCE 5 巻 ( 4 ) 頁： 1296 - 1304 2014年

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

Triphenylboranes planarized with three methylene bridges exhibited dual fluorescence bands around 340 and 400 nm despite their structural constraint. To elucidate the origin, their excited state dynamics were experimentally and theoretically studied. The measurements of fluorescence lifetimes and transient absorption spectra indicated that the planarized triphenylboranes adopt two local minimum structures in the lowest-energy excited singlet (S-1) state. The TD-DFT potential energy surface of the S-1 state possesses at least two minimum energy structures associated with a planar and a bowl-shaped molecular structure. The theoretical S-1-S-0 transition energies at these geometries were in good agreement with the experimentally observed values. These results indicated that the plane-to-bowl structural relaxation in the S-1 state is the origin of the dual fluorescence. Based on the calculated partial atomic charge on the boron atom, the structural deformation to the bowl-shaped structure results in an increase in the electron density on the boron center. Thus, the enhanced intramolecular charge-transfer character plays a role in this structural deformation. Similar behavior was also observed for trigonally pi-expanded planarized borane derivatives. These results provide an important implication that structural constraint in a planar fashion is not only a strategy to construct a rigid skeleton, but also a viable mechanism to impart flexibility to the skeleton.

DOI： 10.1039/c3sc52751d

Web of Science

pi-Extended Planarized Triphenylboranes with Thiophene Spacers

Shuto Ayumi, Kushida Tomokatsu, Fukushima Tatsuya, Kaji Hironori, Yamaguchi Shigehiro

ORGANIC LETTERS 15 巻 ( 24 ) 頁： 6234 - 6237 2013年12月

Modification and Unexpected Reactivity of 2-Borylbenzaldimines: Acylated and Silylated Derivatives as Well as Dimeric Compounds

Neue Benedikt, Wakarniya Atsushi, Froehlich Roland, Wibbeling Birgit, Yamaguchi Shigehiro, Wuerthwein Ernst-Ulrich

JOURNAL OF ORGANIC CHEMISTRY 78 巻 ( 23 ) 頁： 11747 - 11755 2013年12月

A Radical Anion of Structurally Constrained Triphenylborane

Kushida Tomokatsu, Yamaguchi Shigehiro

ORGANOMETALLICS 32 巻 ( 22 ) 頁： 6654 - 6657 2013年11月

Diarylated Bi(thieno[2,3-c]thiophene)s: A Ring-Fusing Strategy for Controlling the Molecular Alignment of Oligoarenes 査読有り

Fukazawa Aiko, Kishi Daisuke, Tanaka Yuki, Seki Shu, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 巻 ( 46 ) 頁： 12091 - 12095 2013年11月

Constraint-induced Structural Deformation of Planarized Triphenylboranes in the Excited State 査読有り

T. Kushida, C. Camacho, A. Shuto, S. Irle, M. Muramatsu, T. Katayama, S. Ito, Y. Nagasawa, H. Miyasaka, E. Sakuda, N. Kitamura, Z. Zhou, A. Wakamiya, and S. Yamaguchi

Chem. Sci. ５巻頁： 1296-1304 2013年11月

Photochemical Double 5-exo Cyclization of Alkenyl-Substituted Dithienylacetylenes: Efficient Synthesis of Diarylated Dithienofulvalenes 査読有り

Fukazawa Aiko, Karasawa Takashi, Zhang Hongyu, Minemura Kazumitsu, Camacho Cristopher, Wang Jian, Irle Stephan, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 巻 ( 40 ) 頁： 10519 - 10523 2013年9月

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