Abstract
Abstract Relations between the chromatographic retention of various classes of homologous compounds in flat-bed chromatography systems and the thermodynamic properties of the latter were investigated. Provided the retention of solute (i) is due to liquid-liquid partition, the RMi is related to the partial molar excess Gibbs free energies of the solute in the mobile and stationary phases, GE im and GE is , by RMi = [(GE im - GE is )/ 2.3RT] - log A, where R and T are the universal gas constant and the absolute temperature of the system, respectively, and A = dmMsφm/dsMmφs, d, M, and φ denoting the densities, molar masses, and cross-sectional areas of the mobile and the stationary phases, m and s, respectively. The difference in the partial molar excess Gibbs free energies per solute methylene group in the mobile and in the stationary phase, related with the RM increment per methylene group of solute by GE m (CH2) - GE s (CH2) = 2.3RTRM (CH2), can be used to characterize the difference in the polarities of ...
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