M. Bodini, M. A. Valle
1990
Citations
0
Influential Citations
16
Citations
Journal
Polyhedron
Abstract
Abstract The redox behaviour of the ligand 2-mercaptobenzoic acid has been studied in dimethylsulphoxide. The combination of the dianion of the ligand with manganese(II) in a 1:2 mole ratio forms a colourless complex whose stability constant has been determined polarographically as 2.8 x 10 9 M −2 . Oxidation of this complex at −0.45 V vs SCE yields a red complex of manganese(III) whose stoichiometry is also 1:2. The complexes have been characterized by cyclic voltammetry, controlled-potential electrolysis, optical spectroscopy and magnetic susceptibility measurements. The formation constant of the [Mn III (2-MBA) 2 ] − complex has been evaluated spectrophotometrically as 9.3 x 10 7 M −2 . These results may be relevant to the development of an adequate model for the active centre of acid phosphatases.