Electrical conductivity of BEDT-TTF composites with gold-derived acceptors obtained by direct charge transfer reaction in the solid state

The realisation and DC electrical conductivity studies of the new series of highly conducting organic composites simply formed by a direct charge transfer reaction between solid bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and AuI or AuBr3 are described. Under appropriate conditions composites of the family (BEDT-TTF)x/(AuI) present metallic properties whereas the group of (BEDT-TTF)y/(AuBr3) shows semiconducting behaviours in spite of relatively high values of their room temperature (RT) electrical conductivity. For comparison, other BEDT-TTF-derived composites obtained by direct solid–solid reaction are mentioned.