TETRAFLUORO AND DICHLORO DERIVATIVES OF THIOPHENE-FUSED DCNQI-TYPE AND TCNQ-TYPE ACCEPTORS - A SYNTHETIC, ELECTROCHEMICAL AND CRYSTALLOGRAPHIC STUDY

Novel thiophene-fused DCNQI derivatives 8 and 11 bearing four fluorine atoms have been obtained in good yield from the corresponding quinone s by reaction with bis(trimethylsilyl) carbodiimide (ETC): The presenc e of four fluorine atoms leads to good acceptor molecules which form c harge transfer complexes in solution with N,N'-tetlamethyl-p-phenylene diamine. The effect of chlorine atoms on the crystal packing in the an aloguous thiophene-fused TCNQ derivatives 3a and 3b is also reported.