Contrast Study of the Oxygenation of Co(Ⅱ) Complexes with Different Bi-/Poly-dentate Ligands

doi:10.7503/cjcu20130354

Abstract

Abstract:

In this paper, the influences of the reversible oxygenation performances of Co(Ⅱ) complexes with different ligands have been investigated in aqueous solution at room temperature. Four types of bi-/polydentate ligands, such as α-amino acids(N/O type), α-amino alcohols(N/O type), polyamine(N/N type) and multi-carboxylic acids(O/O type), have been selected to conduct a comparative research, and the oxygenation performances have been determined via UV-Vis spectrophotometry and oxygen electrode. The results showed that the cobalt(Ⅱ) complexes of O/O type polydentate ligands had no oxygenation properties; the complexes of N/N type bidentate ligands were proved to have strong capability to uptake oxygen, while the oxygenation process was irreversible. Great differences of oxygenation performance between α-amino acids Co(Ⅱ) complexes and α-amino alcohols Co(Ⅱ) complexes have been found:α-amino acids Co(Ⅱ) complexes exhibited reversible oxygenation performance, however, the Co(Ⅱ) complexes of α-amino alcohols with one hydroxy group displayed no oxygenation, but the complexes of α-amino alcohols with two hydroxy groups could absorb oxygen weakly while the process was irreversible. Meanwhile the mechanism of reversible oxygenation performance of Co(Ⅱ) complexes that containing —OH and —COOH groups in N/O type bidentate ligand were analyzed and studied. It can be estimated that the group of α-amino acid is the basic coordination structure unit of the Co(Ⅱ) complexes which have the reversible oxygenation performance.

Key words: Bi-/poly-dentate ligand, Cobalt(Ⅱ) complex, Oxygenation performance, α-Amino acid, Oxygen carrier

CLC Number:

O614

TrendMD:

WEN Hong-Mei, ZHANG Xu, LI Hui, YUE Fan, WANG Ji-De. Contrast Study of the Oxygenation of Co(Ⅱ) Complexes with Different Bi-/Poly-dentate Ligands[J]. Chem. J. Chinese Universities, 2013, 34(10): 2262.

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