Summary
The complexes formed from cobalt(III) and dipeptides such as glycylglycine, glycylaspartic acid, glycylthreonine, glycyltyrosine and glycylproline were studied. The formation process of cobalt(III)-dipeptide species was investigated by spectrophotometry after oxidizing the cobalt(II) complexes by sodium peroxide. The formation of the cobalt(III) complexes occurs through an oxo-intermediate, as shown by the spectral behaviour, and depends on the pH of the solutions.
Complex stoichiometries, molar absorptivities and concentration ratios at the equilibrium of the cobalt(III)-dipeptide complexes were determined at pH 2.2 to avoid the formation of binuclear dioxygen-cobalt complexes.
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Canepari, S., Carunchio, V. & Vinci, G. Formation of cobalt(III) compounds with some peptides. Transition Met Chem 12, 426–428 (1987). https://doi.org/10.1007/BF01171655
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DOI: https://doi.org/10.1007/BF01171655