Faculty Profiles - YAMAGUCHI, Shigehiro

Papers - YAMAGUCHI, Shigehiro

Division display 301 - 320 of about 377 ／ All the affair displays >>

Reactions of Fused Polycyclic 1,2-Dithiins with Transiton Metals: Synthesis of Heteroacenes via Desulfurization

K. Kudoh, T. Okamoto, and S. Yamaguchi

Organometallics Vol. 25 page： 2374-2377 2006

Boron as a Key Component for New pi Electron Materials Open Access

S. Yamaguchi and A. Wakamiya

Pure Appl. Chem. Vol. 78 page： 1413-1424 2006

Ladder pi-Conjugated Materials with Main Group Elements Open Access

S. Yamaguchi, C. Xu, and T. Okamoto

Pure Appl. Chem. Vol. 78 page： 721-730 2006

Boron as a Key Component for New pi Electron Materials Open Access

S. Yamaguchi, A. Wakamiya

Pure Appl. Chem. Vol. 78 page： 1413-1424 2006

Intramolecular B-N coordination as a scaffold for electron-transporting materials: Synthesis and properties of boryl-substituted thienylthiazoles

Atsushi Wakamiya, Takuhiro Taniguchi, Shigehiro Yamaguchi

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION Vol. 45 ( 19 ) page： 3170 - 3173 2006

Synthesis and photophysical properties of new π-electron systems containing boryl groups at the side positions Reviewed

A. Wakamiya, C.-H. Zhao, K. Mori, S. Yamaguchi

Polymer Preprints, Japan Vol. 55 ( 2 ) page： 3023 - 3024 2006

Synthesis, structures, and photophysical properties of silicon and carbon-bridged ladder oligo(p-phenylenevinylene)s and related pi-electron systems

S Yamaguchi, CH Xu, H Yamada, A Wakamiya

JOURNAL OF ORGANOMETALLIC CHEMISTRY Vol. 690 ( 23 ) page： 5365 - 5377 2005.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE SA

A series of partially or fully fused ladder oligo(p-phenylenevinylene)s (LOPVs) and related pi-electron systems has been synthesized. Thus, the intramolecular reductive cyclization of o-silyl-substituted bis(phenylethynyl)benzenes with lithium naphthalenide produces partially silicon-bridged bis(styryl)benzenes consisting of silaindene or disilaindacene skeletons. By combining this cyclization with the Friedel-Crafts type electrophilic cyclization, a homologous series of the fully fused LOPVs and related compounds, bearing silicon and carbon bridges, has been synthesized in fairly good yields. The longest example of the LOPVs is the 13-ring-fused system that has a nearly flat pi-conjugated framework with a length of 2.9 nm, as proven by X-ray crystallography. All the produced ladder pi-electron systems show intense fluorescence in the visible region with high quantum yields as well as relatively small Stokes shifts. As the silicon contents increase or the disilaindacene skeleton is incorporated, the emission maxima shift to the longer wavelengths and the fluorescent quantum yields slightly decrease. These trends can be rationalized as due to the sigma* effect of silicon, wherein the silicon bridges contribute to the electronic structure through sigma*-pi* orbital interaction that cause the red-shifts ill the emission maxima and suppress the radiative decay process from the singlet excited state. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jorganchem.2005.05.019

Web of Science

General synthesis of thiophene and selenophene-based heteroacenes

T Okamoto, K Kudoh, A Wakamiya, S Yamaguchi

ORGANIC LETTERS Vol. 7 ( 23 ) page： 5301 - 5304 2005.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

A new intramolecular triple cyclization of bis(o-haloaryl)diacetylenes, via dilithiation followed by reaction with chalcogen elements, produces pi-conjugated compounds containing heterole-1,2-dichalcogenin-heterole fused tricyclic skeletons. The subsequent dechalcogenation with copper metal affords a series of thiophene- and selenophene-based heteroacenes.

DOI： 10.1021/ol0523650

Web of Science

PubMed

The chemistry of silicon-containing ladder pi-conjugated systems Open Access

Yamaguchi S, Xu CH

JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN Vol. 63 ( 11 ) page： 1115 - 1123 2005.11

The chemistry of silicon-containing ladder pi-conjugated systems Open Access

S Yamaguchi, CH Xu

JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN Vol. 63 ( 11 ) page： 1115 - 1123 2005.11

Language：English Publishing type：Research paper (scientific journal) Publisher：SOC SYNTHETIC ORGANIC CHEM JPN

The intramolecular reductive cyclization of bis(o-silylphenyl)acetylenes with lithium naphthalenide produces bis-silicon-bridged stilbenes. Based on this new cyclization, a series of silicon-bridged ladder pi-conjugated systems consisting of the p-phenylenevinylene framework have been synthesized, including the partially or fully silicon-bridged bis (styryl) benzenes, extended ladder oligo(p-phenylenevinylene)s, and bis-silicon-bridged stilbene-based pi-conjugated polymers. All the ladder pi-electron systems show intense fluorescence in the visible region. The detailed elucidation of their photophysical properties revealed the significant effect of the silicon moieties on the fluorescence properties.

DOI： 10.5059/yukigoseikyokaishi.63.1115

Open Access

Web of Science

Toward pi-conjugated molecule bundles: Synthesis of a series of B,B ',B ''-trianthryl-N,N ',N ''-triarylborazines and the bundle effects on their properties

Wakamiya A, Ide T, Yamaguchi S

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Vol. 127 ( 42 ) page： 14859 - 14866 2005.10

Solubilization by different-sized surfactant mixtures.

Yamaguchi S

Journal of colloid and interface science Vol. 286 ( 1 ) page： 355 - 9 2005.6

Ladder oligo(p-phenylenevinylene)s with silicon and carbon bridges

CH Xu, A Wakamiya, S Yamaguchi

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Vol. 127 ( 6 ) page： 1638 - 1639 2005.2

A key role of orbital interaction in the main group element-containing pi-electron systems

Yamaguchi S, Tamao K

CHEMISTRY LETTERS Vol. 34 ( 1 ) page： 2 - 7 2005.1

Ladder Oligo(p-phenylenevinylene)s with Silicon and Carbon Bridges

C. Xu, A. Wakamiya, and S. Yamaguchi

J. Am. Chem. Soc. Vol. 127 page： 1638-1639 2005

General Synthesis of Thiophene and Selenophene-Based Heteroacenes

T. Okamoto, K. Kudoh, A. Wakamiya, and S. Yamaguchi

Org. Lett. Vol. 7 page： 5301-5304 2005

The Chemistry of Silicon-Containing Ladder p-Conjugated Systems Open Access

S. Yamaguchi and C. Xu

Vol. 63 page： 1115-1123 2005

Toward pi-Conjugated Molecular Bundles: Synthesis of a Series of B,B',B"-Trianthryl-N,N',N"-triarylborazines and the Bundle Effects on their Properties

A. Wakamiya, T. Ide, and S. Yamaguchi

J. Am. Chem. Soc Vol. 127 page： 14859-14866 2005

Synthesis, Structures, and Photophysical Properties of Silicon and Carbon-Bridged Ladder Oligo(p-phenylenevinylene)s and Related pi-Electron Systems

S. Yamaguchi, C. Xu, H. Yamada, and A. Wakamiya

Vol. 690 page： 5365-5377 2005

A Key Role of Orbital Interaction in the Main Group Element-Containing -Electron Systems

S. Yamaguchi and K. Tamao

Chem. Lett. Vol. 34 page： 2-7 2005

　 PREV - NEXT 　

<YAMAGUCHI, Shigehiro>

Papers - YAMAGUCHI, Shigehiro