Abstract
Abstract Infrared spectra were obtained for dioxygen adducts of a series of cobalt(II) and iron(II) cyclidene complexes with 1-methylimidazole as the axial base. The v o-o bands were located in the range 1137–1163 cm−1, and their identity was confirmed by 18O2 isotopic substitution. The frequency was found to be insensitive of the metal ion but dependent on both the σ and π electron donating properties of the cyclidene ligands. There is no apparent correlation between v o-o and the oxygen affinity; v o-o alternates with the even or odd number of carbon atoms in the bridging polymethylene group because of a symmetry effect on the π electron system of the ligand.
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