Synthesis and characterisation of a very low-coordinate diferrous [2Fe–2S]0 unit

Abstract

Here we present the synthesis of a unique diferrous [2Fe–2S]⁰ complex with only three-coordinate iron ions via reduction of a four-coordinate diferric [2Fe–2S]²⁺ complex with concomitant ligand loss. The obtained compounds were thoroughly examined for their properties (e.g. by ⁵⁷Fe Mössbauer spectroscopy and magnetic susceptibility measurements). Facile cleavage of the [2Fe–2S] rhombus, commonly seen as rather stable, by CS₂ is also shown.