Structure and Properties of a BEDT-TTF-Based Organic Conductor with a Ferrocene-Based Magnetic Anion Octamethylferrocenedisulfonate

The structure and properties of a new semiconducting BEDT‐TTF‐based charge‐transfer salt containing the magnetic monoanion octamethylferrocenedisulfonate [–O3S‐C5(CH3)4Fe+C5(CH3)4‐SO3– (ofds)], α‐(BEDT‐TTF)5(ofds)2 is described [BEDT‐TTF = bis(ethylenedithio)tetrathiafulvalene]. The salt is a semiconductor with ρRT = 5.6 × 103 Ω cm and Ea = 0.11 eV. There are two types of spins not only on the ferrocenyl parts but also on the 2D donor layers. The former and latter spins obey the Curie–Weiss (C = 0.721 emu K mol–1 and θ = –5.5 K) and 2D Heisenberg (J2DH = –80.3 K) models, respectively.