Abstract
The complexation of 2,2′-diazino bis (3-ethyl 6-sulfonate benzothiazole) (ABTS) by α-, β- and γ-cyclodextrin (CD) in aqueous media has been investigated by voltammetry and uv spectrophotometry. The inclusion process in CD was indicated by changes in the limiting current, the half-wave potential and the uv spectrum. Each of these effects was quantitatively evaluated and the characteristic parameters of the anodic oxidation of ABTS in the presence of CD were obtained. The 1:1 (guest:host) ratio inclusion complexes are the major species with natural CDs whereas the 1:2 complexes are also involved with modified CDs (methyl, hydroxyethyl and hydroxypropyl derivatives). Several methods have been used for the determination of association constants, whose values are sensitive to hydrophobic and electrical charge parameters of the substrate as well as to hydrogen bonding. The total anodic oxidation is a CEC process in which no direct electron transfer of the inclusion complex could clearly be detected.
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