Kinetic studies of the complex formation in the system of cyclodextrin, iodine, and iodide.

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Kinetic studies of complex formation in the system consisting of cyclodextrin, iodine, and iodide have been made by the temperature-jump method. By addition of α-cyclodextrin to the iodine–iodide solution, a new relaxation in addition to that due to I62−, formation was observed, but not in the case of addition of β-cyclodextrin. The reciprocal relaxation time is independent of the iodine concentration, but increases with increase of both iodide and α-cyclodextrin concentration, with a tendency to reach a constant value at their high concentrations. From these concentration dependences of the relaxation time, the observed relaxation was assigned to the conformational change of the complex between α-cyclodextrin and iodide ion, and the rate constants were estimated to be 5.9×105 and 1.2×105s−1 for the forward and backward processes, respectively. A rationalization for the difference between α-cyclodextrin and β-cyclodextrin in this complex formation is proposed in terms of the molecular structure of cyclodextrin.
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