Abstract
Abstract Ultrasonic absorption measurements in aqueous solutions of tert-butyl and allyl alcohols were carried out in the frequency range of 4.5–220 MHz at 25 °C. Two relaxation processes were observed in aqueous solution of tert-butyl alcohol and a single one in that of allyl alcohol. The former relaxation mechanisms were revealed to be due to the perturbation of the equilibria expressed by (Remark: Graphics omitted.) where A and B were alcohol and water molecule respectively. The latter mechanism was due to that expressed by (Remark: Graphics omitted.). The rate constants for all these processes were determined from the concentration dependence of the relaxation frequencies. The water structure in aqueous solutions was discussed in terms of a hydrophobic interaction, and it was concluded that the hydrophobic interaction decreased in this sequence, tert-butyl, n-propyl and allyl alcohols.
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