Preparation, structures and physical properties of selenium analogues of DTEDT as promising donors for organic metals

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Three selenium analogues of DTEDT [2-(1,3-dithiol-2-ylidene)-5-[2-(1,3-dithiol-2-ylidene)ethylidene]-1,3,4,6-tetrathiapentalene] have been synthesized. They showed four pairs of single-electron redox waves. The E1 values are a little higher by 0.02–0.05 V than that of DTEDT. On the other hand, the E2−E1 values are almost equal to that of DTEDT. Their TCNQ complex and cation radical salts show fairly high electrical conductivities and several salts exhibit metallic conductivities. In particular the ReO4− and Au(CN)2− salts of DTEDS and the SbF6−, TaF6− and I3− salts of DSEDS exhibited stable metallic behaviour down to 1.5–4.2 K. An X-ray crystal structure analysis of the metallic salt (DSEDS)3TaF6 reveals that this salt has a two-dimensional β-type packing motif of the donor molecules similar to the superconducting (DTEDT)3Au(CN)2. The calculated Fermi surface of (DSEDS)3TaF6 is a two-dimensional closed ellipsoid.

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