Abstract
The adsorption of β-cyclodextrin, β-CD, on a polycrystalline gold electrode has been studied in NaClO 4, LiClO 4 and Na 2SO 4 dilute solutions by impedance measurements. The adsorption of β-CD is similar to that for other organic compounds such as dimethylsulphoxide. β-CD is a strong adsorbate, half coverage (θ/2) being reached in solutions containing less than 5×10 −5 mol dm −3. It was shown that the main symmetry axis of the adsorbed β-CD molecule is oriented perpendicular to the electrode surface. The adsorption of β-CD on the polycrystalline gold electrode follows a Langmuir isotherm with \\ ̄ gD G max o = −34.70 ± 0.57 kJ mol −. The observed behaviour has been compared with the literature data for β-CD adsorption on the Hg electrode.
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