2001 Fiscal Year Final Research Report Summary
Molecular design for crystal engineering of organic conductors
| Project/Area Number |
12640569
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tokyo Institute of Technology |
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Principal Investigator |
YAMASHITA Yoshiro Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Professor, 大学院・総合理工学研究科, 教授 (90116872)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Organic conductor / X-ry crystal structure / molecular design / charge transfer complex / pyridine / hydrogen bonding / 超分子 |
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| Research Abstract |
Preparation of new organic molecules affording conducting materials is the most important for the development ; in the field of organic conductors. At the same time, it is important to control the crystal structures to achieve the high conductivities in the solid state. However, the crystal engineering is still difficult and remains as a challenging theme. We have now designed various novel molecules by considering weak intermolecular interactions such as hydrogen bonding, heteroatom contacts, and steric interactions. For example, we have prepared various TTF vinylogues and found that the cation radical states of the derivatives containing ortho-substituted phenyl groups at 1 the vinyl positions are thermodvnamically stable. The crystal structures are very unique and different depending on the substituents. On the other hand, TCNDQ analogues fused with thiadiazole rings were prepared as strong electron acceptor and afforded highly conductive CT complexes with donors. The structures of the anion radical salts were revealed by X-ray analysis to have tape-like networks with short S…N contacts between the thiadiazole rings. TCNDQ analogues containing a bisthiazole skeleton were also prepared as the first isolated TCNQ analog containing nitrogen atoms in the skeleton. Molecules with pyridyl substituents at the terminal positions are expected to be alligator clips for syntheses of molecular devices. Three novel compounds of 4,7-bis(Pyridylethynyl)-2,1,3- benzothiadiazoles were synthesized here. The insertion of a benzothiadiazole moiety backbone brings about a large increase in electron affinity and the bispyridyl compounds obtained here show high fluorescence efficiencies. Such dipyridyl compounds afforded complexes with chloranilic acid by hydrogen bonding.
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Research Products
(18 results)
