Temperature effect on the characteristic solute–solvent retention interactions, calculated with Abraham's solvation model, for 16 GLC stationary phases

Abstract

Specific stationary phase constants used in Abraham's solvation model were determined by multiple linear regression analysis (MLRA) for 16 stationary phases (SP) at various temperatures. Hydrogen-bond acidity complexes were negligible for all SPs. The influence of temperature on the solute–SP interactions and on its different terms, both nonpolar (or cavity-dispersion), and polar, has been determined for a series of solutes. Good negative-slope straight lines both for the cavity-dispersion vs. T and for the polar contribution vs. T plots were obtained, the former having a much greater slope than the latter. Also, the dependence of the cavity-dispersion and of the polar retention terms for various chemical functions in three SPs at different temperatures was studied. The cavity-dispersion term increased with decreasing temperature, while the polar term was almost temperature independent. At each temperature, the cavity-dispersion term increased with the Z chain length, excellent linear correlations being obtained for every chemical function tested.