ADSORPTION OF MALEIMIDE AND ITS DERIVATIVES ON AN IRON ELECTRODE IN ACIDIC AND NEUTRAL MEDIA

The impedance method was applied to the study of the adsorption of mal eimide, N-(p-aminophenyl)maleimide, and N-(p-nitrophenyl)maleimide on a polycrystalline iron electrode in neutral and acidic media. It was f ound that the addition of maleimide and its derivatives to a sodium su lfate or a sulfuric acid solution, respectively, leads to the decrease of the iron double layer capacitance. It was shown that the adsorptio n of the substances investigated was described by Frumkin's isotherm. A correlation is found between the adsorption parameters, determined e lectrochemically, and the data obtained by quantum-chemical calculatio ns.