Chemistry Letters, Vol.34, No.2, 254-255, 2005
Structural and physical properties of lambda-(BEST)(2)MCl4 (BEST = bis(ethylenediseleno)tetrathiafulvalene; M = Fe, Ga) and analogous magnetic organic conductor
In contrast to lambda-(BETS)(2)MCl4 (M = Fe, Ga) with superconducting (Ga) or pi-d coupled antiferromagnetic insulating (Fe) ground states, lambda-(BEST)(2)MCl4 (M = Ga, Fe) are semi-conducting at ambient pressure despite of the close similarity of the crystal structures. There exists another triclinic modification of BEST conductor with FeBr4- exhibiting metal-insulator and antiferromagnetic transitions.