Structures and Transport Properties of New Molecular Conductors Based on TMEO-ST-TTP
説明
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.
収録刊行物
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- Journal of Solid State Chemistry
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Journal of Solid State Chemistry 168 (2), 608-615, 2002-11
Elsevier BV
