1996 Fiscal Year Final Research Report Summary
Synthesis of Novel Electrically Conductive pi-Conjugated Polymers with Charge Transferred Structure Along the Polymer Chain
| Project/Area Number |
07455369
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
高分子合成
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
YAMAMOTO Takakazu Research Laboratory of Resources Utilization, TOKYO INSTITUTE OF TECHNOLOGY,Professor, 資源化学研究所, 教授 (10016743)
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| Project Period (FY) |
1995 – 1996
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| Keywords | pi-Conjugated Polymer / Organometallic / Polycondensation / Charge Transfer / Electronic Properties / Optical Properties |
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| Research Abstract |
Polymers composed of aromatic structural units show both electrical conductivity, photoluminescence, and non-linear optical behavior owing to the pi-conjugated structure of the main chain. They are basically classified into polymers containing electron rich aromatic rings such as polythiophene and polyselenophene that are doped with oxidant to give electrically conductive materials and those having electron deficient aromatic such as polypyridine and polyquinoxaline that undergo chemical and electrochemical n-doping. The present study aims synthesis and characterization of novel pi-conjugated polymers containing electron rich and electron poor aromatic rings in an alternating fashion as well as utilization of the resulting polymers to electrochemical and optical materials.
Ni (0) complex promoted dehalogenative polycondensation of dibromro (pyridylthiophene) gave the corresponding polymer composed of alternating thiophene and pyridine rings in the main chain. Various pi-conjugated polym
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ers containing both electron rich and electron poor aromatic rings were obtained similarly from dihaloaromatic compounds. Introduction of several organic groups as the side chain of the polymers was helpful to increase the solubility or to tune the electronic state of the polymers. Poly (pyridyl) thiophene had unique electrochemical behavior and showed the difference between the oxidation and reduction potentials, which were much larger than expected for common reversible redox. It is attributed to the observation that one electronic oxidation of the thiophene ring in the molecule induce charge transfer in the structural unit to result in a novel electronic state of the structural unit that undergoes reduction at very low potential. The polymer shows the third-order non-linear optical property better than poly (thiophene) and poly (pyridine) owing to a junction of thiophene and pyridine ring in the polymer chain.
In summary, I have suceeded in preparation and characterization of novel pi-conjugated polymers containing electron rich and poor aromatic rings alternatingly and found unique elctrochemical and optical properties. Less
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Research Products
(103 results)
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[Publications] T.Miyamae, D.Yoshimura, H.Ishii, Y.Ouchi, K.Seki, T.Miyazaki, T.Koike, and T.Yamamoto: "Ultravillet Photoelectron Spectroscopy of Poly (pyridine-2,5-diyl), Poly (2,2'-bipyridine-5,5'-diyl), and Their K-doped States" J.Chem.Phys.103. 2738-2744 (1995)
Description
「研究成果報告書概要(欧文)」より
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[Publications] T.Miyamae, D.Yoshimura, H.Ishii, Y.Ouchi, T.Miyazaki, T.Koike, T.Yamamoto, and K.Seki: "Photoemission Study of Poly (pyridine-2,5-diyl), Poly (2,2'-bipyridine-5,5'-diyl), and their K-doped State" J.Electron Spectroscopy. 78. 399-402 (1996)
Description
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[Publications] T.Yamamoto, Z.-H.Zhou, T.Kanbara, M.Shimura, K.Kizu, T.Maruyama, Y.Nakamura, T.Fukuda, B.-L.Lee, N.Ooba, S.Tomaru, T.Kurihara, .Kaino, K.Kubota, and S.Sasaki: "pi-Conjugated Donon-Acceptor Copolymers Consitituted of pi-Excessive and pi-Deficient Arylene Units. Optical and Electrochemical Properties in Relation to CT Structure of the Polymer" J.Am.Chem.Soc.118. 10389-10399 (1996)
Description
「研究成果報告書概要(欧文)」より
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