Synthesis, electrical properties and X-ray crystal structure of a new BEDT-TTF-based radical cation salt with α-Keggin heteropolymolybdate

Abstract

The electrical properties and X-ray single crystal structure of the salt of BEDT-TTF, bis(ethylenedithio)tetrathiafulvalene, with α-Keggin anion, (BEDT-TTF) 8[SiMo 12O 40]·10H 2O are reported. It is an isomorph of α 1-(BEDT-TTF) 8[XW 12O 40] and its conductivity is lower than those for other BEDT-TTF salts with the Keggin anions due to longer chalcogen–chalcogen contacts. In contrast to the corresponding molybdophosphate, the anion in the hybrid radical salt is not reduced owing to its slightly lower redox potentials. The distortion of the silicomolybdic anion is discussed in relation with the size of TTF-like moieties.