ADSORPTION OF N-PHENYLMALEIMIDE AND ITS DERIVATIVES AT THE IRON ELECTRODE

Adsorption of N-phenylmaleimide and its derivatives (N-p-methoxyphenyl maleimide and N-p-bromophenylmaleimide) at the iron electrode in neutr al water-ethanol solutions was studied by the impedance method. The di fference in adsorption behavior of the compounds was found by using ba ck integration of the capacity curves and the potential dependence of the adsorption energy. It was shown that adsorption of the methoxy-der ivative is described by a single adsorption state, while for N-phenylm aleimide and N-p-bromophenylmaleimide, two adsorption states are obser ved in the plot of Delta G(A)(0) vs. electrode potential. An attempt w as made to find a correlation between the calculated adsorption parame ters and quantum-chemical calculations.