Conducting complexes of TTF and TSF derivatives fused with selenium-containing five-membered rings

Electrocrystallization of bis(ethyleneseleno)-tetrathiafulvalene (BES-TTF) and -tetraselenafulvalene (BES-TSF) gave a variety of radical cation salts which had high room-temperature conductivities (60-280 S cm(-1)) and displa yed a metal-to-semiconductor (insulator) transition at low temperature. Amo ng them, however, the ClO4- and AsF6- salts of BES-TSF remained highly cond ucting even at cryogenic temperature. An X-ray crystallographic analysis of (BES-TTF)(2)SbF6, revealed that the complex carries a considerably two-dim ensional interactive electronic structure.