Enthalpies of transfer of alkane solutes from the vapor state to organic solvents

1 February 1985

journal article
Published by Canadian Science Publishing in Canadian Journal of Chemistry

Vol. 63 (2) , 349-352
https://doi.org/10.1139/v85-059

Abstract

Heats of solution of 5 – 8 C₅–C₁₆ alkane liquids have been determined in each of 19 organic solvents covering the Taft–Kamlert π* (dipolarity-polarizability) range −0.08 to 1.00. Enthalpies of alkane transfer from vapor to solvents have been calculated (ΔH(v → S) = ΔH_s − ΔH_v). The methylene increments in (ΔH(v → S) in the 19 solvents and water (−1.18 to −0.67 kcal/mol) are not well correlated with the Hildebrand solubility parameter δ, but an empirical correlation exists with solvent π* and polarizability:[Formula: see text](n = 20, r = 0.977, see = 0.032). By this criterion the small methylene increment in water appears to be associated with the high dipolarity and low polarizability of water.

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