Collect. Czech. Chem. Commun. 1999, 64, 585-594

The Effect of p-Toluidine on the Two-Step Electroreduction of Zn(II) in Water-Methanol and Water-Dimethylformamide

Barbara Marczewska

Faculty of Chemistry, Maria Curie-Skłodowska University, PL 20-031 Lublin, Poland


The acceleration effect of p-toluidine on the electroreduction of Zn(II) on the mercury electrode surface in binary mixtures water-methanol and water-dimethylformamide is discussed. The obtained apparent and true forward rate constants of Zn(II) reduction indicate that the rate constant of the first electron transfer increases in the presence of p-toluidine. The acceleration effect may probably be accounted for by the concept of the formation on the mercury electrode an activated complex, presumably composed of p-toluidine and solvent molecules.

Keywords: Acceleration of rate constant; Zinc; Electrochemistry; Electroreduction; Polarography; Coulometry.