The Use of Partial Molal Entropies and Free Energies in the Characterization of Gas Chromatographic Stationary Phases

Abstract

The partial molal enthalpy (ΔH_s^m), entropy (ΔS_s^m), and free energy (ΔG_s^m) of solution are reported for the following functional groups: -CH₂-, -CH₃, -CHO, = O, -OC(O)H, -OC(O)CH₃ and -O-. These values are reported on 75 liquid phases using 50 solutes. The ΔG_s^m values for the functional groups are used to rank the selectivities of the liquid phases toward each functional group. Additionally, the ΔH_s^m and ΔS_s^m values are used to predict retention data for various solutes.