Abstract
Ultrasonic absorption coefficients were measured in aqueous β-cyclodextrin (host) solutions with 1-butyramide (guest), with methyl propionate (guest) and with methyl butyrate (guest) by pulse and resonance methods in the frequency range from 0.8 to 95 MHz at 25 °C. The cause of a single relaxational absorption observed was ascribed to a perturbation of a chemical equilibrium associated with β-cyclodextrin and nonelectrolyte interaction. From the concentration dependence of the ultrasonic parameters, the rate and equilibrium constants were determined. These results were compared with those reported already in other systems with β-cyclodextrin and were discussed in relation to the β-cyclodextrin and guest molecular structures. It was found that the interactions of β-cyclodextrin with the nonelectrolytes were dependent on the characteristics of hydrophobicity and functional group of the guests.
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