The influence of α-, β- and γ-cyclodextrins on the kinetics of the electrode reactions in 1 M NaClO 4 and 0.5 M Na 2SO 4 aqueous solutions

Abstract

The kinetics of the reactions in the systems Cu 2+/Cu(Hg), Cd 2+/Cd(Hg) and Eu 3+/Eu 2+ in the presence of α-, β- and γ-cyclodextrins (CDs) have been investigated using polarographic and chronocoulometric methods. The complexity of CD adsorption, e.g. the discontinuities in the capacity-potential curves, is fully reflected in the polarographic curves of the electrode system investigated. The steric factors determined from the experiments agree with the estimated geometric dimensions of the cyclodextrins, as well as with the cross-sectional areas of the hydrated Cu 2+ and Cd 2+ ions determined previously in the presence of aliphatic alcohols.