Molecular interactions of alkanediols in methanol and in water: density and heat capacity measurements

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The heat capacities and densities of dilute solutions of 1,2-alkanediols (1,2-propanediol, 1,2-butanediol, 1,2-pentanediol) and α, ω-alkanediols (1,3-propanediol, 1,4-butanediol, 1,5-pentanediol) in methanol as well as those of 1,2-butanediol and 1,2-pentanediol in water were determined at 298.15 K. Apparent molar heat capacities and volumes for these solutions in methanol and in water were calculated. The scaled particle theory (SPT) was used to determine heat capacity of cavity formation (Δ C p(cav)) and the solute–solvent “interaction term” Δ C p(int). The behaviour of the alkanediols in methanol and in water was compared and discussed.