Two new cation radical bis(ethylenedithio)tetraselenafulvalene (BETS) salts, alpha-(BETS)(6)Bi3Cl12 center dot PhCl and (BETS)(2)Bi2Cl8: synthesis, structure and conducting properties. First characterisation of the new trinuclear anion [Bi3Cl12](3-)

摘要

Two new radical cation salts, (BETS)(6)Bi3Cl12. PhCl 1 and (BETS)(2)Bi2Cl8 2, where BETS is bis(ethylenedithio)tetraselenafulvalene, have been obtained and their structures and conducting properties studied. Salt 1 has a layered structure, consisting of radical cation layers of the a type, and segregated anion sheets containing discrete [Bi3Cl12](3-) trinuclear anions and PhCl solvent molecules. It is metallic down to 180 K. The crystal structure of salt 2 consists of stacks of BETS radical cations, with polymeric [(Bi2Cl8)(n)](2n-) anion chains arranged in a chessboard fashion. The compound 2 exhibits semiconducting properties. [References: 24]