Copper tetraglycine complex

Under anaerobic conditions, the copper(III)-tetraglycine complex, [Cu(H 3G4)] , oxidizes SO3 to SO3 in two one-electron steps (10) and (11). The SO3 formed subsequently hydrolyzes to sulfate with a rate... 

The tetraglycine complex of ter-valent copper, [Cu(III)(H 3G4)] , is moderately stable in neutral solution (tvi for redox decomposition 5.5 h at This reaction has been investigated over a very wide pH range (0.3-13.5). In acid solution (pH 3-6), the decomposition results in the oxidation of some of the tetracoordinated glycine and Cu(II) is formed. Two reactants are involved... 

Figure 1 shows the reactions of the triply-deprotonated tetraglycine (H G ) complex of copper(III) with acid (16). 

Copper (III)-Peptide Complexes. Molecular oxygen reacts with Cu(II)tetraglycine (G4) in neutral solution to produce a yellow species with an intense absorption band at 362 nm. As the oxygen in the solution is consumed, the amount of the yellow species decays (Figure 6). The uv-visible spectrum, molar absorptivity, dissociation kinetics in acid and in base, and the redox behavior of this yellow species are similar to those of Cunl(H.3G4)", which is generated by IrCl62 or by electrolytic oxidation of the corresponding Cu(II) complex. The peptide products after... 

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