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| - Ultrasonic Relaxation Due to Complexation Reaction between β-Cyclodextrin andAlkylammonium Ions
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| Abstract
| - Ultrasonic absorption coefficients in an aqueous solution of propylammonium chloride (PACL) andbutylammonium chloride (BACL) (pH ≈ 7.2) were measured in the presence and absence of β-cyclodextrin(β-CD) at 25 °C in the frequency range 0.8−220 MHz. There was no relaxation in the solution of individualalkylammonium chloride or β-CD. Also, in the solution with PACL and β-CD, the relaxation was not observed.However, a single relaxational absorption was found in the solution of BACL when β-CD coexisted. Thecause of the relaxation was attributed to a perturbation of a chemical equilibrium associated with an interactionbetween β-CD and the butylammonium ion from the concentration dependence of the relaxation frequencyand the maximum absorption per wavelength. The rate and thermodynamic constants were determined forthe association and dissociation reactions of the complex in the system of BACL with β-CD. The resultsobtained were compared with those for other similar systems, e.g., propionate ion or propionic acid andalcohols with β-CD. It was ascertained that the stability of the complex formed between BACL and β-CD isrelatively lower than those between other guests and β-CD.
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