Peroxo complexes resonance spectra

The proton magnetic resonance spectrum has a doublet centered at t 27.1 (stretching frequency, in the infrared spectrum (Nujol mull), is at 2079(s) cm.-1. The interaction of the complex with alkenes produces5 stable alkyl complexes of the type [Rh(NH3)5R]S04. In solution the complex reacts with molecular oxygen to give a blue peroxo complex displacement of ammonia by ethylenediamine can also be achieved.6... 

Lippard et al detected new intermediates, compounds L and Q in the catalytic cycle of MMOH from M. capsulatus (Bath) [65]. These are similar to the compounds P and Q, respectively, for MMOH from M. trichosporium OB3b. The intermediates were trapped by applying the same method as Lipscomb et al [61, 62]. After addition of dioxygen gas to the diferrous MMOH, the compound L was detected from the sample of 155 ms interval, and the compound Q was detected from the sample of 3 s interval. Resonance Raman spectrum of the compound L shows that the compound L is a diiron peroxo complex [66]. The detailed analysis of the Mossbauer spectrum of the compound L shows that the compound L has a synmietrical structure and suggests that the peroxo ligand of compound L coordinates in the I-T t or the I-T ti binding mode. 

The resonance Raman spectrum of [ Cu(L) 2(02)]2+, where L = tris(7V-benzylaminoethyl)-amine, contains vCuO features at 556 and 539 cm-1, suggesting the presence of two peroxo species in solution.387 There is resonance Raman evidence for the formation of peroxo and bis(p-oxo) species (from characteristic vCu02 and vCuOCu bands) on treatment of Cu 2 or Cun2 complexes of polyamine ligands with 02 or H202.388... 

McCandlish et al. have isolated a peroxo-iron(III) complex (9) (Fig. 4) in the reaction of Fe(III)TPP(Cl) and KO2 according to Eq. (4) (37). The Soret band of 9 appears at 437 nm with unusually red-shifted a- and -b-bands (565 and 609 nm in DMSO). The EPR spectmm of 9 at 77K showed a relatively narrow, sharp resonance at g = 4.2 and weak resonances at g = 2 and g = 8, typical of rhombic high-spin ferric complexes such as Fe" EDTA (JS). Such a spectrum is not typical of high-spin ferric porphyrin complexes, which usually show resonance at g = 2 and 6, indicative of axial symmetry. An IR band at 806 cm" was observed to shift to 759 cm when K 02 rather than K 02 was used to prepare solutions of 9 these observations suggested the side-on bonding formulation illustrated in Fig. 4. Extended X-ray absorption fine structure (EXAFS) studies of 9 also... 

The adsorption of O2 on iron supported on zeolite MFl produced an IR band at 730 cm (698 cm in 02) assigned to the bridging peroxo-species Fe(02)Fe. " The resonance Raman spectrum of a peroxide intermediate derived from iron diazacyclononane includes vOO of an iron(III) peroxide complex at 854 cm (consistent with side-on geometry). ... 

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