ELECTROCHEMICAL-BEHAVIOR OF THE SCHIFF-BASE FROM PYRIDINE-4-ALDEHYDE AND N-HEXYLAMINE

A study of the Schiff base from pyridine-4-aldehyde and n-hexylamine (SBPYH) was carried out. Equilibrium in solution, between the aldehyde, amine and Schiff base, was reached in the time scale of the experiments. In dc and DP polarography one or two waves were obtained, depending on the experimental conditions. The effects of the pH, the amine concentration and the capillary characteristics were studied. The apparent constant of the SBPYH formation was obtained as a function of the pH. The current-time curves show the influence of the hydration-dehydration reactions of the aldehyde in the overall process. Polarographic parameters, Tafel slope, reaction orders and voltammetric results account for the electroreduction of the azomethine group in neutral and basic media. © 1990.