研究者詳細 - 山口　茂弘

論文 - 山口　茂弘

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ESIPT-active organic compounds with white luminescence based on crystallization-induced keto emission (CIKE)

Liu Huapeng, Cheng Xiao, Zhang Houyu, Wang Yue, Zhang Hongyu, Yamaguchi Shigehiro

CHEMICAL COMMUNICATIONS 53 巻 ( 55 ) 頁： 7832 - 7835 2017年7月

Structures and Physical Properties of Chemically Reduced Diindenosiloles and Their pi-Extended Derivatives

Ryo Takano, Ryo Shintani, Aiko Fukazawa, Shigehiro Yamaguchi, Koji Nakabayashi, Shin-ichi Ohkoshi, Kyoko Nozaki

ORGANOMETALLICS 36 巻 ( 14 ) 頁： 2646 - 2653 2017年7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：AMER CHEMICAL SOC

Diindenosilole Si1, a silicon-bridged fulvalene derivative, was successfully reduced to its dianions using various alkali metals, and the structures were characterized by X-ray crystallographic analysis. Radical anions of Si1 as well as dianions of pi-extended Si3 could also be synthesized, and the structural and physical properties were systematically compared. It was also found that the NMR spectra of dianions Si1(2-) and Si3(2-) show countercation and temperature dependency for their signal broadness, indicating the possible existence of thermal interconversion between closed-shell singlet states and open-shell triplet states.

DOI： 10.1021/acs.organomet.7b00260

Web of Science

A Near-Infrared Dye That Undergoes Multiple Interconversions through Acid-Base Equilibrium and Reversible Redox Processes 査読有り

Asai Kengo, Fukazawa Aiko, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 56 巻 ( 24 ) 頁： 6848 - 6852 2017年6月

Flapping viscosity probe that shows polarity-independent ratiometric fluorescence

Ryota Kotani, Hikaru Sotome, Hajime Okajima, Soichi Yokoyama, Yumi Nakaike, Akihiro Kashiwagi, Chigusa Mori, Yuki Nakada, Shigehiro Yamaguchi, Atsuhiro Osuka, Akira Sakamoto, Hiroshi Miyasaka, Shohei Saito

JOURNAL OF MATERIALS CHEMISTRY C 5 巻 ( 21 ) 頁： 5248 - 5256 2017年6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：ROYAL SOC CHEMISTRY

A variety of fluorescent molecular viscosity probes have been widely used for mapping the local viscosity in cells and for monitoring the microenvironments in materials. However, their viscosity-sensing structural design still relies strongly on molecular rotors featuring intramolecular rotational dynamics. Here we report flapping molecules (FLAP) as a ratiometric viscosity-sensing fluorophore that shows polarity-independent dual fluorescence. Viscosity-sensing mechanism is based on a unique V-shaped-to-planar conformational change in the singlet excited state (S-1), in which the flexible motion of an eight-membered ring plays an important role. Fast conformational dynamics have been studied by time-resolved spectroscopies, and the viscochromic properties have been quantitatively analyzed. Application of FLAP to monitoring the curing process of epoxy resins has also been demonstrated, in which other typical environment-sensitive dyes did not work as a local viscosity probe.

DOI： 10.1039/c7tc01533j

Web of Science

Synthesis and Physical Properties of Strained Doubly Phosphorus-Bridged Biaryls and Viologens

Greulich Tobias W., Yamaguchi Eriko, Doerenkamp Carsten, Luebbesmeyer Maximilian, Daniliuc Constantin G., Fukazawa Aiko, Eckert Hellmut, Yamaguchi Shigehiro, Studer Armido

CHEMISTRY-A EUROPEAN JOURNAL 23 巻 ( 25 ) 頁： 6029 - 6033 2017年5月

Facile Synthesis of Polycyclic Pentalenes with Enhanced Huckel Antiaromaticity

Oshima Hiroya, Fukazawa Aiko, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 56 巻 ( 12 ) 頁： 3270 - 3274 2017年3月

Color-tunable fluorescent nanoparticles encapsulating trialkylsilyl-substituted pyrene liquids

Masayasu Taki, Saki Azeyanagi, Kenzo Hayashi, Shigehiro Yamaguchi

JOURNAL OF MATERIALS CHEMISTRY C 5 巻 ( 8 ) 頁： 2142 - 2148 2017年2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：ROYAL SOC CHEMISTRY

The development of emissive liquid dyes containing trialkylsilyl groups, and their use in the preparation of fluorescent organic nanoparticles (FONs) are described. A series of trialkylsilyl-substituted pyrenes is synthesized as oils, whose viscosity depends on the nature of the alkyl groups. The neat compounds show intense excimer emission with maxima of around 460-480 nm and quantum yields of 0.5-0.7. The low viscosity (eta = 162 cP) of 2-tri((Z)-3-hexen-1-yl)silylpyrene (1) allows the preparation of spherical nanoparticles (NP1) in the presence of 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) and cholesterol. NP1 shows a hydrodynamic diameter of 161 +/- 48 nm and maintains an excimer emission similar to that of neat 1. NP1 in water spontaneously absorbs dopant dyes into its liquid core, and simultaneous doping with two dyes is also possible. When using green-emissive C545T and red-emissive DCJTB dyes as dopants, efficient Forster resonance energy transfer (FRET) occurs from the pyrene excimer to the dyes. Extensive emission color tuning is thus achieved as evident from a plot of the emission colors of doped and undoped NP1 on the CIE 1931 xy chromaticity diagram. These results demonstrate the efficacy of the present design strategy for color-tunable FONs that do not require premixing of dopant dyes.

DOI： 10.1039/c6tc05208h

Web of Science

Color-tunable fluorescent nanoparticles encapsulating trialkylsilyl-substituted pyrene liquids

Masayasu Taki, Saki Azeyanagi, Kenzo Hayashi, Shigehiro Yamaguchi, Shigehiro Yamaguchi

Journal of Materials Chemistry C 5 巻頁： 2142 - 2148 2017年1月

© The Royal Society of Chemistry. The development of emissive liquid dyes containing trialkylsilyl groups, and their use in the preparation of fluorescent organic nanoparticles (FONs) are described. A series of trialkylsilyl-substituted pyrenes is synthesized as oils, whose viscosity depends on the nature of the alkyl groups. The neat compounds show intense excimer emission with maxima of around 460-480 nm and quantum yields of 0.5-0.7. The low viscosity (η = 162 cP) of 2-tri((Z)-3-hexen-1-yl)silylpyrene (1) allows the preparation of spherical nanoparticles (NP1) in the presence of 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) and cholesterol. NP1 shows a hydrodynamic diameter of 161 ± 48 nm and maintains an excimer emission similar to that of neat 1. NP1 in water spontaneously absorbs dopant dyes into its liquid core, and simultaneous doping with two dyes is also possible. When using green-emissive C545T and red-emissive DCJTB dyes as dopants, efficient Förster resonance energy transfer (FRET) occurs from the pyrene excimer to the dyes. Extensive emission color tuning is thus achieved as evident from a plot of the emission colors of doped and undoped NP1 on the CIE 1931 xy chromaticity diagram. These results demonstrate the efficacy of the present design strategy for color-tunable FONs that do not require premixing of dopant dyes.

DOI： 10.1039/c6tc05208h

Scopus

Quantum Dots Embedded in Graphene Nanoribbons by Chemical Substitution. 査読有り

Carbonell-Sanromà E, Brandimarte P, Balog R, Corso M, Kawai S, Garcia-Lekue A, Saito S, Yamaguchi S, Meyer E, Sánchez-Portal D, Pascual JI

Nano letters 17 巻 ( 1 ) 頁： 50 - 56 2017年1月

Steric Shielding vs Structural Constraint in a Boron-Containing Polycyclic Aromatic Hydrocarbon 査読有り

V. M. Hertz, N. Ando, M. Hirai, M. Bolte, H.-W. Lerner, S. Yamaguchi, M. Wagner

Organometallics 2016年12月

Stable Red-Emissive Cationic Dithienotropylium Dyes 査読有り

Asai Kengo, Fukazawa Aiko, Yamaguchi Shigehiro

CHEMISTRY-A EUROPEAN JOURNAL 22 巻 ( 49 ) 頁： 17571 - 17575 2016年12月

A Soluble Dynamic Complex Strategy for the Solution-Processed Fabrication of Organic Thin-Film Transistors of a Boron-Containing Polycyclic Aromatic Hydrocarbon 査読有り

Matsuo Kyohei, Saito Shohei, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 55 巻 ( 39 ) 頁： 11984 - 11988 2016年9月

Light-melt adhesive based on dynamic carbon frameworks in a columnar liquid-crystal phase. 査読有り

Saito S, Nobusue S, Tsuzaka E, Yuan C, Mori C, Hara M, Seki T, Camacho C, Irle S, Yamaguchi S

Nature communications 7 巻頁： 12094 2016年7月

A Macrocyclic Fluorophore Dimer with Flexible Linkers: Bright Excimer Emission with a Long Fluorescence Lifetime. 査読有り

Osaki H, Chou CM, Taki M, Welke K, Yokogawa D, Irle S, Sato Y, Higashiyama T, Saito S, Fukazawa A, Yamaguchi S

Angewandte Chemie (International ed. in English) 55 巻 ( 25 ) 頁： 7131 - 7135 2016年6月

Pyridyl Directed Catalyst-Free trans-Hydroboration of Internal Alkynes 査読有り

Yuan Kang, Suzuki Naoya, Mellerup Soren K., Wang Xiang, Yamaguchi Shigehiro, Wang Suning

ORGANIC LETTERS 18 巻 ( 4 ) 頁： 720 - 723 2016年2月

Phospha-fluorescein: a red-emissive fluorescein analogue with high photobleaching resistance. 査読有り

Fukazawa A, Suda S, Taki M, Yamaguchi E, Grzybowski M, Sato Y, Higashiyama T, Yamaguchi S

Chemical communications (Cambridge, England) 52 巻 ( 6 ) 頁： 1120 - 1123 2016年

A biphenyl containing two electron-donating and two electron-accepting moieties: a rigid and small donor-acceptor-donor ladder system 査読有り

Greulich Tobias W., Suzuki Naoya, Daniliuc Constantin G., Fukazawa Aiko, Yamaguchi Eriko, Studer Armido, Yamaguchi Shigehiro

CHEMICAL COMMUNICATIONS 52 巻 ( 11 ) 頁： 2374 - 2377 2016年

A planarized 9-phenylanthracene: a simple electron-donating building block for fluorescent materials 査読有り

Iwahara Hideaki, Kushida Tomokatsu, Yamaguchi Shigehiro

CHEMICAL COMMUNICATIONS 52 巻 ( 6 ) 頁： 1124 - 1127 2016年

Boron-doped nanographene: Lewis acidity, redox properties, and battery electrode performance 査読有り

Osumi Shinichiro, Saito Shohei, Dou Chuandong, Matsuo Kyohei, Kume Keita, Yoshikawa Hirofumi, Awagaa Kunio, Yamaguchi Shigehiro

CHEMICAL SCIENCE 7 巻 ( 1 ) 頁： 219 - 227 2016年

A Phosphole Oxide Based Fluorescent Dye with Exceptional Resistance to Photobleaching: A Practical Tool for Continuous Imaging in STED Microscopy. 査読有り

Wang C, Fukazawa A, Taki M, Sato Y, Higashiyama T, Yamaguchi S

Angewandte Chemie (International ed. in English) 54 巻 ( 50 ) 頁： 15213 - 15217 2015年12月

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