Abstract
Dark coloured samples of Vn2E2·TCNQ (1,2) and Vn2E2·DCQ (3,4)+ were studied. Compounds (1) and (2) form columnar structures in which donors and acceptors alternate. Structures of (3) and (4) have not been determined until now, but scanning electron microscopy results point to their being isotypical to each other and different from (1) and (2). With polycrystalline samples dc and ac conductivities between 280 and 350 K were measured and a typical semiconducting behaviour was found.From ESR measurements spin concentration n and with σ values charge carrier mobility b were evaluated. Spin concentrations correlate with magnetic susceptibility results.At room temperature, values of spin concentration and electrical conductivity of DCQ compounds are higher than those of the corresponding TCNQ complexes.
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