Extensively conjugated homologues of selenophene-TCNQ as new electron acceptors.
5,5′-Bis(dicyanomethylene)-5,5′-dihydro-2,2′-biselenophene, its 3,3′-dibromo derivative, and 5,5″-bis(dicyanomethylene)-5,5″-dihydro-2,2′:5′,2″-terselenophene have been synthesized as extensively conjugated homologues of selenophene-TCNQ. The 3,3′-dibromo compound posseses a considerably better accepting character than selenophene-TCNQ or the other extended homologues and can form highly conductive molecular complexes.