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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
Author(s) -
Hester R. E.,
Nour E. M.
Publication year - 1981
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250110111
Subject(s) - chemistry , raman spectroscopy , resonance (particle physics) , hydrogen peroxide , transition metal , metal , excitation , molecular electronic transition , peroxide , spectral line , ion , photochemistry , analytical chemistry (journal) , inorganic chemistry , molecule , catalysis , atomic physics , biochemistry , physics , electrical engineering , organic chemistry , chromatography , astronomy , optics , engineering
Resonance Raman spectra are reported for the purple intermediate formed in the reactions of [Fe(II)(EDTA)] 2− and [Fe(III)(EDTA)] − with O 2 − and H 2 O 2 , 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(FeN) mode and the 824 cm −1 band to ν(OO). The structure of the species is shown to be the peroxide ion complex [Fe(III)(EDTA)(O 2 )] − . The O 2 2− → Fe 3+ electronic charge‐transfer transition is assigned at 454 nm.