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Interaction of beta-cyclodextrin with cadmium(II) ions.

Reduction of Cd(II) on a dropping mercury electrode was used to study interaction of beta-cyclodextrin with Cd(II) ions. It was found that Cd(II) forms Cdbeta-CD(OH)(2)(2-) hydroxy-complex with the anion of beta-cyclodextrin in alkaline solutions (pH>11), the logarithm of stability constant being 10.4+/-0.1 (20 degrees C; I=1.0). The calculated value of the diffusion coefficient equal to 1.0x10(-6)cm(2)/s shows a large size Cd(II) complex species formation in alkaline solutions containing beta-CD.