Synthesis and Characterization of Radical Cation Salts ofBis(Ethylenedithio)Tetraselenafulvalene

摘要

Four 2:1 radical cation salts (SbF6, CF3SO3, GaCl4, CuN(CN), 2Br) ofbis(ethylenedithio)tetraselenafulvalene (BETS) have been prepared and scrutinized by X-ray crystallography, DC resistivity measurements (300-10K), rf penetration depth experiments (0.5K), pressure studies (0.5-5kbar, 4K), and tight-binding band calculations. The salts are Kappa-phase, and three are metallic to low temperatures, Kappa-(BETS)2 CuN(CN)2Br is isostructural with K-(ET)2 CuN(CN)2Br. Organic conductors.