Crystallographic and structural analysis of iron heterometallic hexa- and heptanuclear complexes

Abstract

This review covers over 100 heterohexa- and almost 60 heteroheptameric iron clusters. There are six categories of the heterohexameric complexes: Fe₅M, Fe₄M₂, Fe₃M₃, Fe₂M₄, FeM₅ and Fe₄MM′, and eight categories of the heterohepta­meric complexes: Fe₆M, Fe₅M₂, Fe₄M₃, Fe₃M₄, Fe₂M₅, FeM₆, Fe_xM_yM′_z and FeRu₄CuAu. The heterometals include the non-transition and transition metals. The shortest Fe-M (non-transition) and Fe-M (transition) in the heterohexa- series are 2.444(3) Å for Fe-Ge and 2.404(20) Å for Fe-Cu, and in the heterohepta- series are 2.316(2) Å for Fe-Ge and 2.438(3) Å for Fe-Au. Correlations between structural parameters, heterometals and ligand donor atoms are developed and an overall summary of the metal-metal distances is given.