Resonance Raman studies of transition metal peroxo complexes: 2‐The purple intermediate formed in the reactions of iron(II) and iron (III)ethylenediaminetetraacetate with superoxide and hydrogen peroxide, respectively

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Abstract
Resonance Raman spectra are reported for the purple intermediate formed in the reactions of [Fe(II)(EDTA)]2− and [Fe(III)(EDTA)]− with O2− and H2O2, respectively, using several different excitation wavelengths. The spectra show only two resonance‐enhanced bands, at 472 and 824 cm−1. The band intensity excitation profiles for these two are different, demonstrating that the resonance effects observed are associated with two different electronic transitions. The 472 cm−1 band is assigned to the ν(FeN) mode and the 824 cm−1 band to ν(OO). The structure of the species is shown to be the peroxide ion complex [Fe(III)(EDTA)(O2)]−. The O22− → Fe3+ electronic charge‐transfer transition is assigned at 454 nm.