A bis-fused donor composed of TTF vinylogues, 2,5-bis(2-ethanediylidene- 1,3-dithiole)-1,3,4,6-tetrathiapentalene (BisEDT, 1a) and its derivatives have been synthesized. Cyclic voltammograms of 1 consist of four-pairs of one-electron redox waves. X-ray structure analysis of tetrakis(methylthio)-1 (1b) reveals the donor adopts almost planar structure. The TCNQF(4) complexes of I showed moderate conductivity of sigma(rt) = 10(-2) S cm(-1) on a compressed pellet.