THE MOLAR EXCESS-ENTHALPIES AND VOLUMES OF 1-ALKYNE + METHANOL AND + ETHANOL MIXTURES AT 298.15 K

The excess enthalpies and volumes of 1-alkyne+methanol and 1-alkyne+ethanol mixtures have been measured at 298.15 K. The alkynes include 1-hexyne, 1-heptyne and 1-octyne. These measurements have been compared with the HEm and VEm values of n-alkane-methanol and n-alkane-ethanol mixtures. The HEm(maxima) for 1-alkyne-ethanol mixtures are between 100 and 200 J mol-1 more positive than the HEm(maxima) for n-alkane-ethanol mixtures. The VEm(maxima) for 1-alkyne-ethanol mixtures are, by contrast, less positive than the VEm(maxima) for n-alkane-ethanol mixtures. The partial molar excess enthalpies and volumes have been calculated and the results are discussed in terms of specific interactions. © 1990.