Faculty Profiles - YAMAGUCHI, Shigehiro

Papers - YAMAGUCHI, Shigehiro

Division display 281 - 300 of about 377 ／ All the affair displays >>

Single-crystal field-effect transistors of benzoannulated fused oligothiophenes and oligoselenophenes

Koichi Yamada, Toshihiro Okamoto, Kenichi Kudoh, Atsushi Wakamiya, Shigehiro Yamaguchi, J. Takeya

APPLIED PHYSICS LETTERS Vol. 90 ( 7 ) page： 072102 2007.2

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

Recently synthesized benzoannulated fused oligothiophenes and oligoselenophenes are introduced as air-stable organic semiconductors for high-performance organic field-effect transistors. To evaluate electronic mobility intrinsic to the materials, the technique of single-crystal transistors is employed for two representative compounds of benzoannulated pentathienoacene f-B5TB and its selenium analog f-BT3STB. High mobility of approximately 1.1 cm(2)/V s is achieved for the selenium compound due to its considerable Se---Se orbital interactions. The materials simultaneously bear features of high mobility and high duration in ambient atmosphere. (c) 2007 American Institute of Physics.

DOI： 10.1063/1.2535617

Web of Science

Scopus

Ladder distyrylbenzenes with silicon and chalcogen bridges: Synthesis, structures, and properties

Kazuhiro Mouri, Atsushi Wakamiya, Hiroshi Yamada, Takashi Kajiwara, Shigehiro Yamaguchi

ORGANIC LETTERS Vol. 9 ( 1 ) page： 93 - 96 2007.1

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

A cascade-type anionic double cyclization of (o-silylphenyl)(o-halophenyl)acetylenes via lithiation followed by treatment with elemental chalcogen produces silicon and chalcogen-bridged stilbenes. Based on this reaction, a series of silicon and sulfur- or silicon and selenium-bridged ladder distyrylbenzenes have been synthesized. Their chemical modification by oxidation, crystal structures, and photophysical properties are described.

DOI： 10.1021/ol062615s

Web of Science

PubMed

General Synthesis of Extended Fused Oligothiophenes Consisting of Even Number of Thiophene Rings

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

Chem. Eur. J. Vol. 13 page： 548-556 2007

Thiophene and Selenophene-Based Heteroacenes: Combined Quantum Chemical DFT, and Spectroscopic Raman and UV-Vis-NIR Study

R. M. Osuna, R. P. Ortiz, T. Okamoto, Y. Suzuki, S. Yamaguchi, V. Hernandez, J. Teodomiro, and L. Navarrete

J. Phys. Chem. B Vol. 111 page： 7488-7496 2007

Highly Emissive Poly(aryleneethynylene)s Containing 2,5-Dibroyl-1,4-Phenylene as a Building Unit

C. -H. Zhao, A. Wakamiya, and S. Yamaguchi

Macromolecules Vol. 40 page： 3898-3900 2007

*3-Boryl-2,2'-Bithiophene as a Versatile Core Skeleton for Full-Color Highly Emissive Organic Solids Open Access

A. Wakamiya, K. Mori, and S. Yamaguchi

Angew. Chem. Int. Ed. Vol. 46 page： 4273-4276 2007

*Single Crystal Field Effect Transistors of Benzo-Annulated Fused Oligothiophenes and Oligoselenophenes

K. Yamada, T. Okamoto, K. Kudoh, A. Wakamiya, S. Yamaguchi, and J. Takeya

Appl. Phys. Lett. Vol. 90 page： 072102 2007

Crystallographic and Chiroptical Studies on Tetraarylferrocenes for Use as Chiral Rotary Modules for Molecular Machines

T. Muraoka, K. Kinbara, A. Wakamiya, S. Yamaguchi, and T. Aida

Chem. Eur. J. Vol. 13 page： 1724-1730 2007

Ladder Distyrylbenzenes with Silicon and Chalcogen Bridges: Synthesis, Structures, and Properties

K. Mouri, A. Wakamiya, H. Yamada, T. Kajiwara, and S. Yamaguchi

Org. Lett. Vol. 9 page： 93-96 2007

3-Boryl-2,2 '-bithiophene as a versatile core skeleton for full-color highly emissive organic solids Open Access

Atsushi Wakamiya, Kenji Mori, Shigehiro Yamaguchi

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION Vol. 46 ( 23 ) page： 4273 - 4276 2007

Crystallographic and Chiroptical Studies on Tetraarylferrocenes for Use as Chiral Rotary Modules for Molecular Machines

T. Muraoka, K. Kinbara, A. Wakamiya, S. Yamaguchi, T. Aida

Chem. Eur. J. Vol. 13 page： 1724-1730 2007

General synthesis of extended fused oligothiophenes consisting of an even number of thiophene rings

Toshihiro Okamoto, Kenichi Kudoh, Atsushi Wakamiya, Shigehiro Yamaguchi

CHEMISTRY-A EUROPEAN JOURNAL Vol. 13 ( 2 ) page： 548 - 556 2007

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

The intramolecular double cyclization of bis(3-bromo-2-thienyl)acetylenes though a lithium-halogen exchange reaction with tBuLi followed by treatment with elemental sulfur produces two thiophene-fused thieno[3,2-c](1,2-dithiin)s. The subsequent dechal-cogenation from the 1,2-dithiins with copper nanopowder affords tetrathienoacenes. On the basis of this two-step procedure, a series of trialkylsilyl-terminated, fused oligothiophenes, including hexathienoacene (a six thiophene-fused system) and octathienoacene (an eight thiophene-fused system), were synthesized. In the UV/Vis absorption and fluorescence spectra of the fused oligothiophenes, the absorption and emission maxima shift to longer wavelengths, as the pi-conjugation length increases. Their maximum wavenumbers have linear relationships with the reciprocal number of thiophene rings consisting of the it-conjugated frameworks. In the cyclic voltammograms, all the compounds show reversible oxidation waves, the first oxidation potential of which shifts to less positive as the conjugation length increases. Among them, the octathienoacene also shows a reversible second oxidation process. Indeed, its chemical oxidation with an excess amount of NO+SbF6- produces the dication as a golden crystal. The crystal structures of the neutral octathienoacene and its dication were determined by X-ray crystallography. While in the neutral state, the octathienoacene has a benzenoid structure with a large bond alternation of about 0.04 angstrom, its dication has a quinoid structure in which two cationic charges are mainly localized on the terminal rings.

DOI： 10.1002/chem.200601064

Web of Science

PubMed

Field effect transistors of single crystal benzo-annulated fused oligothiophenes and oligoselenophenes Reviewed

Y. Tominari, K. Yamada, M. Yamagishi, Jun Takeya, T. Okamoto, K. Kudoh, A. Wakamiya, S. Yamaguchi

Materials Research Society Symposium Proceedings Vol. 1003 page： 112 - 117 2007

Publishing type：Research paper (international conference proceedings)

Recently synthesized benzo-annulated fused oligothiophenes and oligoselenophenes are introduced as air-stable organic semiconductors for high-performance organic field-effect transistors. To evaluate electronic mobility intrinsic to the materials, single-crystal transistors are prepared for two representative compounds of benzo-annulated pentathienoacene f-B5TB and its selenium analogue f-BT3STB. High mobility of more than 1 cm2/Vs is achieved for the selenium compound, due to its considerable Se- - -Se orbital interactions. The transistor performances have been stable for two months, indicating high duration of the compound in the ambient atmosphere. Copyright © 2007 Materials Research Society.

Scopus

Highly emissive organic solids containing 2,5-diboryl-1,4-phenylene unit

Cui-Hua Zhao, Atsushi Wakamiya, Yuko Inukai, Shigehiro Yamaguchi

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Vol. 128 ( 50 ) page： 15934 - 15935 2006.12

High fidelity self-sorting assembling of meso-cinchomeronimide appended meso-meso linked Zn(II) diporphyrins

Taisuke Kamada, Naoki Aratani, Toshiaki Ikeda, Naoki Shibata, Yoshiki Higuchi, Atsushi Wakamiya, Shigehiro Yamaguchi, Kil Suk Kim, Zin Seok Yoon, Dongho Kim, Atsuhiro Osuka

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Vol. 128 ( 23 ) page： 7670 - 7678 2006.6

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

In noncoordinating solvents, meso-cinchomeronimide appended Zn(II) porphyrin 2 forms a cyclic trimer, while diporphyrins 7 exhibit high-fidelity self-sorting assembling to form discrete cyclic trimer, tetramer, and pentamer with large association constants from 7(in-in), 7(in-out), and 7(out-out), respectively, through almost perfect discrimination of enantiomeric and conformational differences of the meso-cinchomeronimide substituents. In the latter self-sorting processes, the dihedral angles dictated by the two pyridyl nitrogen atoms control the size of the aggregates; the trimer from 7(in-in), the tetarmer from 7(in-out), and the pentamer from 7(out-out). Cyclic structures of (2) 3 and (R-7(out-out)) 5 have been determined by single-crystal X-ray diffraction analysis.

DOI： 10.1021/ja0611137

Web of Science

PubMed

Reactions of fused polycyclic 1,2-dithiins with transition metals: Synthesis of heteroacenes via desulfurization

K Kudoh, T Okamoto, S Yamaguchi

ORGANOMETALLICS Vol. 25 ( 9 ) page： 2374 - 2377 2006.4

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

Bis(thieno[3,2-b]thiophene)-fused 1,2-dithiin reacts with a stoichiometric amount of Ni(cod)(2)/2PPh(3) to produce a dimeric Ni(II) complex via the oxidative addition of the disulfide bond in the 1,2-dithiin skeleton to the Ni(0) center. An X-ray crystal structure analysis revealed that this complex has a dimeric structure in which one sulfur atom derived from the disulfide bond bridges two metal centers. The resultant Ni complex undergoes desulfurization at elevated temperature to produce a fully fused thiophene-based heteroacene.

DOI： 10.1021/om051000g

Web of Science

Ladder pi-conjugated materials with main group elements Open Access

S Yamaguchi, CH Xu, T Okamoto

PURE AND APPLIED CHEMISTRY Vol. 78 ( 4 ) page： 721 - 730 2006.4

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：INT UNION PURE APPLIED CHEMISTRY

Ladder-type pi-conjugated skeletons are promising building units for new materials for organic electronics, wherein their annelated coplanar structures enhance the pi-conjugation, leading to a set of desirable properties such as intense fluorescence and high carrier mobility. As a new entry into this class of skeletons, we now disclose two series of ladder molecules, i.e., silicon- and carbon-bridged oligo(p-phenylenevinylene)s and thiophene- and selenophene-based heteroacenes. The former ladder molecules contain the silole substructure in which the silicon bridges affect the electronic structure and thus photophysical properties through the sigma*-pi* conjugation. The latter heteroacenes can be recognized as the heteroatom analogs of acenes and may be promising materials for organic thin film transistors. These two series of molecules have been synthesized based on newly developed intramolecular cyclizations of acetylenic compounds.

DOI： 10.1351/pac200678040721

Web of Science

Intramolecular B-N Coordination as a New Scaffold for Design of Electron Transporting Materials: Synthesis and Properties of Boryl-Substituted Thienylthiazoles

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

Angew. Chem. Int. Ed. Vol. 45 page： 3170-3173 2006

Highly Emissive Organic Solids Containing 2,5-Diboryl-1,4-Phenylene Unit

C. -H. Zhao, A. Wakamiya, Y. Inukai, and S. Yamaguchi

J. Am. Chem. Soc. Vol. 128 page： 15934-15935 2006

Highly Fidelity Self-Sorting Assembling of meso-Cinchomeronimide Appended meso-meso Linked Zn(II) Diporphyrins

T. Kamada, N. Aratani, T. Ikeda, N. Shibata, Y. Higuchi, A. Wakamiya, S. Yamaguchi, K. S. Kim, Z. S. Yoon, D. Kim, A. Osuka

J. Am. Chem. Soc. Vol. 128 page： 7670-7678 2006

　 PREV - NEXT 　

<YAMAGUCHI, Shigehiro>

Papers - YAMAGUCHI, Shigehiro