CALCULATION OF ABRAHAM MODEL L-DESCRIPTOR AND STANDARD MOLAR ENTHALPIES OF VAPORIZATION FOR LINEAR C7-C14 ALKYNES FROM GAS CHROMATOGRAPHIC RETENTION INDEX DATANeel Shanmugam, Shrika Eddula, William E. Acree Jr, Michael H. Abraham.
Abraham model L solute descriptors have been determined for an additional 33 linear C7-C14 alkynes based on published gas chromatographic retention indices for solutes eluted from capillary columns coated with squalane and apiezon L stationary phases. Standard molar enthalpies of vaporization and sublimation at 298 K are calculated for the 33 linear alkynes using the reported solute descriptors and our recently published Abraham model correlations. Calculated vaporization enthalpies derived from the Abraham model compare very favourably with values based on a popular atom-group additivity model.
Key words: Linear alkynes, Abraham model, solute descriptors, enthalpy of vaporization, Kovats retention indices.