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Molecular conductors on the basis of bis(ethylenedithio)tetraselenafulvalene (BETS) with tetrahedral anions TlCl4–, MnBr42–, and CoCl42– were synthesized and studied by X-ray diffraction analysis. The salts under study exhibit various conducting properties: κ-(BETS)2TlCl4 (I) is a superconductor with Tc = 2.5 K, θ-(BETS)4MnBr4 · 2C2H5OH (II) is a metal up to ≈30 K, while (BETS)2CoCl4 (III) is a dielectric. Salt I has κ-packing of the donor molecules, salt II has θ-packing, whereas salt III has no conducting layers. These structural differences are mainly the reasons for different conducting properties of compounds I–III. |
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