Abstract
Ultrasonic absorption coefficients in an aqueous solution of propylammonium chloride (PACL) and butylammonium 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 individual alkylammonium 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. The cause of the relaxation was attributed to a perturbation of a chemical equilibrium associated with an interaction between β-CD and the butylammonium ion from the concentration dependence of the relaxation frequency and the maximum absorption per wavelength. The rate and thermodynamic constants were determined for the association and dissociation reactions of the complex in the system of BACL with β-CD. The results obtained were compared with those for other similar systems, e.g., propionate ion or propio...
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