Resumo

RAMIREZ-DELGADO, Vanessa et al. The Role of the π Acceptor Character of Polypyridine Ligands on the Electrochemical Response of Co(II) Complexes and its Effect on the Homogenous Electron Transfer Rate Constant with the Enzyme Glucose Oxidase. J. Mex. Chem. Soc [online]. 2015, vol.59, n.4, pp.282-293. ISSN 1870-249X.

In this work the electrochemical behavior of Co(II) complexes with substituted bidentate and tridentate polypyridine ligands [CoL₃](BF₄)₂ and [CoL'₂](NO₃)₂ in 0.1M phosphate buffer pH 7.2 was studied. A reversible electrochemical process Co(II)L_n →Co(III) L_n+1e^- was observed. A linear relationship between the redox potential (E°) and the pKa of the non-coordinated ligand was found. It was demonstrated by DFT calculations the use of pKa value as a descriptor of the π acceptor character of a ligand. The electrochemical response in the presence of glucose oxidase (GOx) was also studied. It was possible to establish a tendency between the homogeneous electron transfer rate constant (ks) and the redox potential (E°) for the compounds studied in this work and other examples taken from the literature.

Palavras-chave : Co(II) complexes; polypyridine ligands; electrochemistry; redox mediator; glucose oxidase; DFT calculations.

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