Bromostibine complexes of iron(II): Hypervalency and reactivity

Abstract

The halostibine complexes [CpFe(CO)2(SbMe2Br)] [CF3SO3] and [CpFe(CO)2(SbMe 2Br)][BF4] both contain significant interactions between the anion and the formally neutral Sb(III) ligand, which simultaneously displays Lewis acidic and Lewis basic properties. The unexpected secondary product [CpFe(CO)(Me2BrSb-μ-Br-SbBrMe2)] is formed in the presence of excess ligand, the strongly associated Br- anion bridging the two Sb donors to form a four-membered FeSb2Br ring. © 2014 American Chemical Society.