Electrochemical study on the selective formation of [Pb(cyclodextrin)2+]surface inclusion complexes at the carbon paste electrode/ClO4− 1 M interphase

The formation constants of surface inclusion complexes were determined using a carbon paste electrode, CPE, and cyclic voltammetry for aqueous-based media containing Pb(II) and α, β and γ cyclodextrins. In order to promote the occupation of the molecular cavities in the cyclodextrins, the medium with the support electrolyte contained ClO4− ions, which have the capacity to modify the hydrophobic properties of such cavities. The results obtained were: Pb(II)-αCDK = 883.7 ± 13.6 M−1, Pb(II)-βCDK = 727.5 ± 20.2 M−1, Pb(II)-γCDK = 782 ± 10.7 M−1.