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) 2 X ( X=PF 6, AsF 6, TaF 6) 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) 2 X ( X=PF 6, AsF 6, TaF 6) exhibit a high conductivity of σ rt=10 0–10 1S cm −1, and retain metallic conductivity down to 4.2K, while the tetrahedral (ReO 4 −) and linear (I 3 − and Au(CN) 2 −) anions give semiconductors. Thermoelectric power of (TMEO-ST-TTP) 2PF 6 shows T-linear temperature dependence characteristic of a metal.
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