Molecular Materials Containing Conducting and Magnetic Sublattices: Phase Transitions in [k-(Et4N)(BEDT-TTF)4M(CN)6, 3 H2O; M = FeIII, CoIII, CrIII]

Abstract We report the preparation, structural and physical investigations of BEDT-TTF (ET) salts formulated β-ET5M(CN)6, 10 H2O with M = FeIII and CoIII and k-[Et4N] (ET)4M(CN)6. 3 H2O with M = FeIII, CoIII and CrIII. The k-phase salts show two phase transitions at 240 K and 150 K, respectively. The first structural transition, at 240 K, is followed by a redistribution of the charges on the ET molecules and the magnetic and electrical properties are explained on the basis of this phenomenon. A facile and convenient route for the preparation of the (R4N)3M(CN)6 [R= C2H5 and C4H9) salts is also presented.