Synthesis and Properties of BEDSe-TTF.

Abstract We report the synthesis and properties of the π-electron donor molecule 4,5:4′,5′-bis(ethylene-1,2-diseleno)-tetrathiafulvalene (BEDSe-TTF) as well as the properties of a novel charge-transfer (C-T) salt derived from it. BEDSe-TTF was obtained in a 25% overall yield by a three step reaction starting from the organometallic complex, bis(tetrabutylammonium)-bis(2-thione-1,3-dithiole-4,5-diselenolato)nickelate(II). A single crystal X-ray structure determination of BEDSe-TTF showed it to be monoclinic, P21/n, with a = 6.842(2), b = 14.047(5), c = 16.094(5) A and β = 94.49(3)° having a unit cell volume of 1542A3 and four molecules per unit cell. Electrochemical oxidation of BEDSe-TTF gave single crystals of BEDSe-TTF+I3−. The structure of this 1:1 C-T salt was also monoclinic, P21/n, with a = 12.503, b = 10.592, c = 15.842 A and β = 100.12° having a unit cell volume of 2065.4 A3 and four molecules per unit cell.