Isomers in the chemistry of iron carbonyls

Abstract
The chemistry of iron carbonyls covers wide fields, as shown by a survey covering the crystallographic and structural data of over 560 examples; approximately 10.5% of those examples exist as isomers and are summarized in this paper. Included are distortion (96.7%) and cis-trans (3.3%) isomerism. These are discussed in terms of coordination about iron atom, bond length and interbond angles. Distortion isomers differ only by degree of distortion in Fe-L bond distances and L-Fe-L bond angles, which are the most common. There are iron atoms in the oxidation states, zero, +2 and +3 and cis-trans isomerism (zero only). The iron atoms are two (bent), four (mostly tetrahedral), five (mostly trigonal-bipyramid) and a pseudo-octahedral coordinated with different degree of distortion.

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