Abstract
Henry's law constants, deviations from Henry's law, self-association constants, self-association numbers and solubilities have been determined for γ-butyrolactone (BL), ethyl acetate (EA), N-methyl-2-pyrrolidinone (NMP) and N,N-dimethylacetamide (DMA) in iso-octane solution. From these and published data the thermodynamics of transfer between the pure liquid state, infinite dilution and saturated solution in iso-octane and the vapor state have been calculated. The large differences between the esters, BL and EA, and the much smaller differences between the amides, NMP and DMA, are attributed to the relative magnitudes of the dipole moments, which control the dipole-dipole and dipole-induced dipole interaction energies and which are themselves governed by molecular conformations. The dipole-induced dipole interactions between BL, NMP, or DMA and iso-octane in iso-octane solution are notably stronger than London dispersion forces.
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Grant, D.J.W., Higuchi, T., Hwang, Y.T. et al. Partial vapor pressures and solubilities of cyclic polar compounds iniso-octane solutions. J Solution Chem 13, 297–311 (1984). https://doi.org/10.1007/BF00645703
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DOI: https://doi.org/10.1007/BF00645703