ELECTROCATALYTIC ACTIVITY OF TETRAMETHYL-TETRA-3,4-PYRIDOPORPHYRAZINOCOBALT(II) ADSORBED ON A GRAPHITE ELECTRODE TOWARDS THE OXIDATION OF HYDRAZINE AND HYDROXYLAMINE

The complex N,N',N '',Ntriple tetramethyl-tetra-3,4-pyridoporphyrazino cobalt(II) ([Co(II)Tmtppa](4+)) irreversibly adsorbed on a graphite el ectrode displays electrocatalytic activity towards the oxidation of bo th hydrazine and hydroxylamine. The kinetics of the electrocatalytic f our-electron oxidation of NH2NH2 and two-electron oxidation of NH2OH a re examined using cyclic voltammetric and rotating disk electrode meth ods, and the corresponding kinetic parameters are obtained. The possib le application of the [Co(II)Tmtppa](4+) modified electrode in sensing NH2NH2 and NH2OH is also discussed in this paper.