Empirical correlations between thermodynamic and spectroscopic properties of aqueous solutions of alkan-m,n-diols. Excess enthalpies and spin–lattice relaxation times at 298.15 K

Abstract

Enthalpies of dilution in water and nuclear relaxation times at 298.15 K have been determined for binary aqueous solutions containing alkan-α,ω-diols and for ternary aqueous solutions containing the probe molecule hexane-1,2- or hexane-1,6-diol and one of the members of the homologous series of alkane-1,2-diols and of alkane-α,ω-diols, up to heptane-1,7-diol. The results were interpreted through the model of preferential orientation, i.e. the ‘side-on’ model, already proposed to explain the interactions in solution between various positional isomers of hydroxylated substances. For binary solutions, a correlation is presented between the relaxation times and the enthalpic self-interaction coefficients.