Novel bis(ethylenedithio)tetrathiafulvalene-based organic conductor with 1,1'-ferrocenedisulfonate

A new bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)-based salt with a ferrocenyl moiety, alpha' ''-(BEDT-TTF)(4)(Fe(C(5)H(4)SO(3))(2)).6H(2)O, has been prepared. The ferrocenyl part of this salt is neutral and diamagnetic, but the magnetic susceptibility is well modeled by a Curie-Weiss law with C = 0.142 emu.K.mol(-1) (approximately 1/3 of s = 1/2 spin). The spin is likely to be localized on the donor layer because of its unique charge disproportionation.