New electron acceptors for organic metals: extensively conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ)

Two conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ) have been prepared, which form highly conductive complexes with typical electron donors such as 2,2′,5,5′- tetrathiafulvalene (TTF) or 5,6,11,12-tetrathiatetracene (TTT); these complexes have extensive conjugation.