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In this work the electrochemical behavior of Co(II) com-plexes 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)Ln → Co(III) Ln +1eˉ was observed. A linear relationship between the redox poten-tial (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 pos-sible to establish a tendency between the homogeneous electron trans-fer rate constant (ks) and the redox potential (E°) for the compounds studied in this work and other examples taken from the literature.

journal of the mexican chemical society

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