| Project/Area Number |
11440201
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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 |
機能・物性・材料
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUGAWARA Tadashi The Univ.of Tokyo, Basic Sciences, Professor, 大学院・総合文化研究科, 教授 (50124219)
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| Co-Investigator(Kenkyū-buntansha) |
KAWADA Yuzo Ibaraki Univ, Materials and Biological Sciences, Professor, 理学部, 教授 (10152969)
泉岡 明 東京大学, 大学院・総合文化研究科, 助手 (90193367)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 2000: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1999: ¥9,000,000 (Direct Cost: ¥9,000,000)
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| Keywords | cross-cyclophane donor / ion-radical salt / supramolecular system / self-assembly / channel structure / electrical conductivity / rectifying effect |
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| Research Abstract |
The results obtained during the research period (1999-2000) is summarized as follows.
(1) A sulfur-linked cross-cyclophane donor was found to afford a semiconductive and paramagnetic ion radical salt which exhibits a structure phase transition at 160 K.In the low-temperature phase the conductivity of the salt was increased by one-order and the number of paramagnetic spins was decreased by one-half compared with those of the high temperature phase. The phase transition turns out to be reversible and it takes place triggered by the dynamics of counter-ions and solvent molecules inside of the channel constructed in the ion radical salts. A full paper to be submitted to J.Am Chem Soc. is in preparation.
(2) A selen-linked cross-cyclophane donor also afforded a semiconductive ion radical salt with a channel structure in a more organized manner. The self-assembled structure of the singly oxidized donor of the cross cyclophane shape is an excellent example which demonstrates the characteristics of a self-assembly composed of a polyhedral building block. A short communication was submitted to Chem. Communication.
(3) A layer-structured ion radical salt composed of BEDT-TTF_3 Cl_2 5H_2O was discovered to exhibit a rectifying effect on the conducting property. The origin of the rectifying effect was ascribe to the current-induced translocation of counter ions assisted by the change of the hydrogen-bonding scheme in the hydrated counter ion layer. A full paper is now in preparation.
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