Structures and Transport Properties of New Molecular Conductors Based on TMEO-ST-TTP |
| |
| Authors: | Yohji Misaki Masateru TaniguchiKazuyoshi Tanaka Kazuo TakimiyaAtsushi Morikami Tetsuo OtsuboTakehiko Mori |
| |
| Affiliation: | a Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Kyoto, 606-8501, Japanb Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japanc Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Tokyo, 152-8552, Japan |
| |
| Abstract: | ![]()
Several radical cation salts based on TMEO-ST-TTP (2-[4,5-bis(methylthio)-1,3-diselenol-2-ylidene]-5-(4,5-ethylendioxy-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) have been prepared. X-ray structure analyses of (TMEO-ST-TTP)2X (X=PF6, AsF6, TaF6) reveal that they have the so-called β-type array of donors with dimerized stacks. A tight-binding band calculation suggests that the present salts have a quasi-one-dimensional Fermi surface. On the other hand (TMEO-ST-TTP)Au(CN)2 has strongly dimerized one-dimensional electronic structure. (TMEO-ST-TTP)2X (X=PF6, AsF6, TaF6) exhibit a high conductivity of σrt=100-101S cm−1, and retain metallic conductivity down to 4.2K, while the tetrahedral (ReO4−) and linear (I3− and Au(CN)2−) anions give semiconductors. Thermoelectric power of (TMEO-ST-TTP)2PF6 shows T-linear temperature dependence characteristic of a metal. |
| |
| Keywords: | radical cation salts organic metal π-electron donor tetrathiapentalene X-ray structure analysis band calculation electrical conductivity: thermoelectric power. |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
