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Series of new π-donors and acceptors based on sulfur heterocycles have been prepared, and the physico-chemical properties of the neutral species as well as their charge-transfer complexes and radical salts were investigated. These new families are an isomeric series of thiophene-fused TCNQ, a homologous series of thieno-acenes, and an unsymmetrical donor family comprised of dithiadiselenafulvalene framework. The unsymmetrical donor dimethyl-(ethylenedithio)dithiadiselenafulvalene (DMET) was found to give various kinds of superconducting radical salts.
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Kobayashi et al. (1989) studied this question.
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