Abstract
Abstract Ultrasonic absorptions in aqueous solutions of allylamine have been measured in the frequency range from 8.5 to 220 MHz at 20 °C. Only a single relaxational absorption has been observed in the concentration range from 0.0562 to 4.00 M; this absorption has been attributed to the proton-transfer reaction. The rate constants and the standard volume change due to the reaction have been determined, and the results are compared with those for aqueous solutions of other amines previously published. It has been elucidated from the ultrasonic absorption data that the presence of the intermediate in the proton-transfer reaction is required in order to analyze the ultrasonic absorption mechanisms quantitatively. The hydrophobic effect in the aqueous solutions of amines has also been discussed.
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