Abstract

The charge transfer compounds (TTF) 2FeCl 3, (TTF) 3FeBr 3, (TTF)RuCl 3·2H 2O, (TTF)RhCl 3·H 2O and (TTF)IrCl 4·CH 3OH were prepared from reaction of solutions of TTF (tetrathiafulvalene) and the metal halide. Magnetic susceptibility and spectroscopic (electronic, vibrational, XPS and EPR) evidence indicate that there is incomplete charge transfer from the TTF donor to iron, and that there is essentially complete charge transfer to ruthenium, rhodium and iridium. The experimental evidence indicates that two electrons are transferred in the rhodium compound. The electrical conductivities of powdered samples of the iron compounds are five orders of magnitude greater than those of the ruthenium, rhodium and iridium compounds, being 6–10 S cm −1 at room temperature. All of the compounds exhibit semiconducting behavior which may be described by a mobility model having a temperature dependent preexponential term and relatively small activation energies.

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