Abstract
Abstract The effect of isomeric butyl alcohols on the temperature of sound velocity maximum in water (TSVM) was studied using a variable path interferometer working at 3 MHz. The structural contribution to the shift in TSVM, [ΔTstr]exp was evaluated for the butyl alcohols and the results are compared with those obtained from studies on the effect of these solutes on the temperature of adiabatic compressibility minimum and density maximum of water. The results indicate that the butyl alcohols enhance the hydrogen-bonded structure of water at low concentrations and at any given concentration, the order of increasing structural contribution to the shift in TSVM being t-butyl>s-butyl>isobutyl>butyl alcohols. The structural propensities of the butyl alcohols as revealed by TSVM studies are in line with the information obtained from the temperature of adiabatic compressibility minimum and density maximum studies. The results of the present study indicate that TSVM studies are useful in understanding the solution structure in aqueous mixtures.
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