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α- Reversible oxidation of amino acid cobalt (ⅱ) complexes

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Document pages: 10 pages

Abstract: We systematically studied the reversibility, aging and oxidation deoxidation properties of 15 natural amino acid co (II) complexes by UV-Vis spectrophotometer, polarographic oxygen electrode and DFT calculation, and discussed the relationship between the coordination structure of amino acid co (II) complexes and reversible oxidation. The results show that the amino acid structure plays a key role in the reversible oxidation of these complexes. The special configuration of amino acid groups affects the electrons transferred from CO (II) to O2 orbital; When O2 is coordinated with CO (II) complex, this phenomenon is also conducive to the reversible formation and dissociation of CO – O2 bond. Therefore, the co coordination of amino and carboxyl groups is very importanta determinant of Co complexes to absorb O2 reversibly. The group adjacent to the -amino acid unit evidently influences the dioxygen affinity and antioxidation ability of the complexes. The presence of amino (or imino) and hydroxy groups adjacent to the -amino acid group increases the oxygenation-deoxygenation rate and the number of reversible cycles. Our findings demonstrate a new mechanism to develop reversible oxygenation complexes and to reveal the oxygenation of oxygen carriers.

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