研究者詳細 - 山口　茂弘

論文 - 山口　茂弘

分割表示 377 件中 101 - 120 件目／全件表示 >>

Antiaromatic Dithieno-1,2-dihydro-1,2-diborin Splits Diatomic Hydrogen Open Access

Araki Takafumi, Hirai Masato, Wakamiya Atsushi, Piers Warren E., Yamaguchi Shigehiro

CHEMISTRY LETTERS 46 巻 ( 12 ) 頁： 1714 - 1717 2017年12月

Phosphole P-Oxide-Containing pi-Electron Materials: Synthesis and Applications in Fluorescence Imaging Open Access

Yamaguchi Shigehiro, Fukazawa Aiko, Taki Masayasu

JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 75 巻 ( 11 ) 頁： 1179-1187 2017年11月

Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase.

Hada M, Saito S, Tanaka S, Sato R, Yoshimura M, Mouri K, Matsuo K, Yamaguchi S, Hara M, Hayashi Y, Röhricht F, Herges R, Shigeta Y, Onda K, Miller RJD

Journal of the American Chemical Society 139 巻 ( 44 ) 頁： 15792 - 15800 2017年11月

An Expedient Procedure for the Synthesis of Benzo[4,5]silolo[2,3-b]thiophenes and Related Systems

Baehr Susanne, Ogasawara Hiroaki, Yamaguchi Shigehiro, Oestreich Martin

ORGANOMETALLICS 36 巻 ( 20 ) 頁： 4013 - 4019 2017年10月

Boron-Stabilized Planar Neutral π-Radicals with Well-Balanced Ambipolar Charge-Transport Properties.

Kushida T, Shirai S, Ando N, Okamoto T, Ishii H, Matsui H, Yamagishi M, Uemura T, Tsurumi J, Watanabe S, Takeya J, Yamaguchi S

Journal of the American Chemical Society 139 巻 ( 41 ) 頁： 14336 - 14339 2017年10月

Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase 査読有り

Hada, Masaki, Saito, Shohei, Tanaka, Sei'ichi, Sato, Ryuma, Yoshimura, Masahiko, Mouri, Kazuhiro, Matsuo, Kyohei, Yamaguchi, Shigehiro, Hara, Mitsuo, Hayashi, Yasuhiko, Röhricht, Fynn, Herges, Rainer, Shigeta, Yasuteru, Onda, Ken, Miller, R J Dwayne

Journal of the American Chemical Society 139 巻頁： 15792 - 15800 2017年10月

Photochemical Intramolecular C-H Addition of Dimesityl(hetero)arylboranes through a [1,6]-Sigmatropic Rearrangement

Ando Naoki, Fukazawa Aiko, Kushida Tomokatsu, Shiota Yoshihito, Itoyama Shuhei, Yoshizawa Kazunari, Matsui Yasunori, Kuramoto Yutaro, Ikeda Hiroshi, Yamaguchi Shigehiro

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 56 巻 ( 40 ) 頁： 12210 - 12214 2017年9月

Selective Conversion of P=O-Bridged Rhodamines into P=O-Rhodols: Solvatochromic Near-Infrared Fluorophores

Grzybowski Marek, Taki Masayasu, Yamaguchi Shigehiro

CHEMISTRY-A EUROPEAN JOURNAL 23 巻 ( 53 ) 頁： 13028 - 13032 2017年9月

Photochemical Intramolecular C−H Addition of Dimesityl(hetero)arylboranes through a [1,6]-Sigmatropic Rearrangement 査読有り

Naoki Ando, Aiko Fukazawa, Tomokatsu Kushida, Yoshihito Shiota, Shuhei Itoyama, Kazunari Yoshizawa, Yasunori Matsui, Yutaro Kuramoto, Hiroshi Ikeda, Shigehiro Yamaguchi

Angewandte Chemie 129 巻 ( 40 ) 頁： 12378 2017年9月

Synthesis of seminaphtho-phospha-fluorescein dyes based on the consecutive arylation of aryldichlorophosphines

Fukazawa Aiko, Usuba Junichi, Adler Raul A., Yamaguchi Shigehiro

CHEMICAL COMMUNICATIONS 53 巻 ( 61 ) 頁： 8565 - 8568 2017年8月

Super-Photostable Phosphole-Based Dye for Multiple-Acquisition Stimulated Emission Depletion Imaging.

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

Journal of the American Chemical Society 139 巻 ( 30 ) 頁： 10374 - 10381 2017年8月

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 Open Access

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

　前のページ - 次のページ　

<山口 茂弘>

論文 - 山口 茂弘

<山口　茂弘>

論文 - 山口　茂弘