Das Redoxsystem Eisen/Iod: Untersuchungen in Acetonitril und Tetrahydrofuran. Eine neue Synthese für Tetraiodoferrat(III) / The Redox System Iron/Iodine: Investigations in Acetonitrile and Tetrahydrofuran. A Novel Synthesis of Tetraiodoferrate(III)

Abstract

The oxidation of iron by iodine in acetonitrile and tetrahydrofuran solution leads to specific redox equilibria. In dependence of the molar ratios of Fe and I₂ the following compounds are isolated: Fe(CH₃CN)₆Fel₄, Fe(CH₃CN)₆(I₃)₂, Fe(C₄H₈O)₆[FeI₃(C₄H₈O)]₂. When Et₄NI is added to a tetrahydrofuran solution of FeI₂ and I₂, Et₄NFeI₄ can be obtained Evidence is presented for the stability of Et₄NFeI₄ to autoreduction. A resonance Raman spectrum has been obtained for Et₄NFeI₄. Crystal data for the different compounds are reported.