7, 7, 8, 8-Tetracyano-p-quinodimethane (TCNQ, 4a) and its derivatives have received much attention by virtue of their reversible stepwise two-electron redox their capacity to form electrically conductive chargetransfer complexes, 2 and the bistable electrical and photochemical switching behavior ascribed to certain metal-TCNQ salts. 3 Although a large number of substituted TCNQ derivatives have been studied in these contexts, the great ...
