Dynamic investigation of aqueous solutions of 2-t-butoxyethanol and 3-methoxy-3-methyl-1-butanol by ultrasonic methods.

概要

論文の詳細を見る
Ultrasonic absorption in the frequency range of 6.5 to 220 MHz has been measured in aqueous solutions of 3-methoxy-3-methyl-1-butanol and 2-t-butoxyethanol as a function of the concentration along with the measurement of sound velocity at 1.92 and 2.5 MHz at 25°C. A single relaxational ultrasonic absorption has been found in both solutions and it is interpreted by a reaction kinetics associated with the interaction between solute and solvent, AB \rightleftharpoons A+B where AB is the complex, A the solute and B the solvent. The forward and backward rate constants for the interaction have been determined from the concentration dependence of the relaxation frequencies to be kf=1.4×108 s−1 and kb=1.1×108 mol−1 dm3 s−1 for 3-methoxy-3-methyl-1-butanol solution and kf=9.0×107 s−1 and kb=1.3×108 mol−1 dm3 s−1 for 2-t-butoxyethanol solution. The water structure has also been estimated from the absorption data and it has been clarified for the water structure promoted by additions of such solutes. Correlations between the structures of the solutes and the ultrasonic properties of the solutions are discussed in terms of the hydrophobicity of the solutes.
公益社団法人日本化学会の論文