Ultrasonic absorption properties of solutions. Part 7.—Mixtures of water + substituted alcohols

Abstract

The ultrasonic absorption properties are reported for alcohol + water mixtures where the alcohol is 2-chloroethanol, 2-bromoethanol, 2-cyanoethanol, allyl alcohol, ethane-1 : 2-diol, propane-1 : 2-diol, propanel-1 : 3-diol, butane-1 : 4-diol and pentane-1 : 5-diol. The glycols and 2-cyanoethanol show little if any excess absorption but the three mixtures, water+2-bromoethanol, allyl alcohol + water and chloroethanol + water have intense excess absorptions which, for the latter two systems, have been analysed using two relaxation frequencies. The dependence of the derived relaxation frequencies on composition and temperature are similar to those previously reported for aqueous mixtures containing t-butyl alcohol, n-propyl alcohol and isopropyl alcohol and it is suggested that the controlling factor is bulk water structure.