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This review summarizes almost 40 structures of polymeric Fe(M), where M=Mg, Ca, Sr, Ba, In, Te, Ge, Sn, Bi, Zn, Cd and Hg complexes. The complexes crystallized in the monoclinic, tetragonal, orthorhombic and triclinic classes, from which the monoclinic by far prevails (∼50%). The most common ligands are with O, N and C donor atoms. The iron atoms are found in the oxidation states 0, +2 and +3, with +3 being the most common. In most complexes the iron(0) is 5-, iron(II) and iron(III) are 6-coordinated, but there are examples of 3-, 5- and even 7-coordinated complexes. The inner coordination spheres about the M atoms range from 3 to 11. The structures are discussed in terms of the coordination about the metal atoms, and correlations are outlined between donor atoms, bond lengths and interbond angles.

Structural characterization of heteropolymeric iron and main group metal complexes