Kinetic Study of the Redox Properties of [5,10,15,20-Tetrakis(2,5-dimethoxyphenyl)porphyrinato]cobalt(II) in the Reaction with Hydrogen Peroxide

摘要

The reaction of [5,10,15,20-tetrakis(2,5-dimethoxyphenyl)porphyrinato]cobalt(II) with hydrogen peroxide in acetonitrile at 298 K has been studied by spectral methods. The kinetic parameters of the redox process have been determined, and a plausible mechanism has been proposed. The reaction involves generation of highly active cobalt porphyrin species capable of oxidizing hydrogen peroxide. Methoxy groups in the ligand have been found to act as redox activators to enhance the reactivity of the complex. The redox potentials of the complex determined by cyclic voltammetry indicate the possibility of formation of one-, two-, and three-electron oxidized species.