Volumetric Properties of Acetonitrile with 1,2-Alkanediols (C2–C6) at 20°C
Tóm tắt
Dilatometric measurements of excess molar volumes, V
E and excess partial molar volumes,
$$\overline V _{\text{i}}^{\text{E}}$$
have been made for binary mixtures of acetonitrile with 1,2-ethanediol, 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, and 1,2-hexanediol at 20°C over the entire composition range. V
E for acetonitrile + 1,2-ethanediol and 1,2-propanediol mixtures are negative over the entire range of mole fractions and positive values are obtained for all remaining mixtures. The results are explained in terms of dissociation of the self-associated 1,2-alkanediol molecules and the formation of aggregates between unlike molecules through O—H...N≡C hydrogen bonding. From the experimental results, V
E were calculated and correlated by Redlich–Kister type function in terms of mole fractions. The excess partial molar volumes were extrapolated to zero concentration to obtain the limiting values at infinite dilution,
$$\overline V _{\text{i}}^{{\text{E,o}}}$$
.
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