INFLUENCE OF REACTANT SIZE ON ELECTROCHEMICAL KINETICS OF EUROPIUM(III) EUROPIUM(II) COMPLEXES WITH SELECTED CHELATING LIGANDS IN THE PRESENCE OF ADSORBED ALIPHATIC-ALCOHOLS

The role of reactant size in the electrochemical kinetics of the series of europium complexes with nitrilo-N,N,N-triacetic acid (NTA), trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acide (DCTA) and ethylenediamino-N,N,N',N'-tetraacetic acid (EDTA) was studied in the presence of n-butanol and n-pentanol adsorbed on a mercury electrode surface. A rise in reactant size causes an increase in inhibiting influence of the adsorbate, expressed in the value r(not-equal)/r(i), the steric factor. The orientation of non-symmetric reactant molecules, under such conditions, is that providing the smallest cross-sectional area on the electrode surface.