Generation and amphoteric redox properties of novel neutral radicals with the TTF-TCNQ hybrid structure

One electron oxidation of 4-(2-tetrathiafulvalenyl)phenyl substituted dicya nomethylides (1-) gave black solids of the title radicals (1(.)). They exhi bit quite high electrochemical amphotericity, which may be responsible for their good electrical conductivities (sigma = ca. 10(-7) S cm(-1)) as a sin gle component. Isomeric radicals (2(.)) with a m-phenylene spacer could not be obtained under the similar conditions probably due to insufficient delo calization of the unpaired electron.