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Abstract
The free energy of adsorption, the surface area of adsorption on silica and alumina surfaces, and the molecular lipophilicity of 37 thiophosphorylglycinamide (TPGA) derivatives was determined by thin layer chromatography using silica and alumina supports and silica support impregnated with paraffin oil. The relationships between the physicochemical characteristics of analytes were elucidated by stepwise regression analysis. It was found that the physicochemical parameters showed high variety between the derivatives, and they depended markedly on the silica and alumina surfaces. In the majority of cases, no linear correlation was found between the parameters.
The free energy of adsorption and the surface area of adsorption on the silica surface showed highly significant correlation, indicating that the energy of adsorption per unit surface is similar for each of the TPGA derivatives and the molecular substructures involved in the adsorption are probably chemically similar.