The electrochemical investigations of tris(1,10-phenanthroline)iron(II) in an aqueous solution

Abstract

The electrochemical oxidation of Fe(phen) 2+ 3 was studied, and the kinetic data were compared to that of homogeneous system on the basis of the Marcus theory. The apparent heat of activation and the entropy of activation for the oxidation reaction were 7.12 kJ/mol −1 and −0.24 kJK −1 mol −1, respectively. It was suggested that the iron-nitrogen(phen) bond was enfeebled and the ordering of the solvent molecules around the reactant was increased in the activated state formed in the electrochemical oxidation of Fe(phen) 2+ 3.