Abstract
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.
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