Ultrasonic Relaxation Associated with Solute–Solvent Interaction in an Aqueous Solution of 5-Methoxy-1-pentanol

After 5-methoxy-1-pentanol was synthesized, the sound velocity, density, and ultrasonic absorption coefficients in the frequency range from 7.5 to 220 MHz were measured in aqueous solutions at 25 °C. The sound velocity and density were reported in terms of the polynomials as a function of the analytical concentration. The absorption could be described approximately by a single Debye-type relaxational equation in the 2.00 and 5.00 mol dm−3 range. The cause of the relaxation was attributed to a perturbation of an equilibrium associated with an interaction between the solute and the solvent; the rate and thermodynamic constants were determined. The results are discussed by comparing them with those previously reported in relation to the water structure.