Abstract
The proposed model of intermolecular interactions contains three independent groups of quantities describing non-polar forces, polar forces, and hydrogen bonds. The contribution of hydrogen bonding to the total energy of intermolecular interaction is represented as a product of some quantum-mechanical threshold value and the probability of molecular arrangement that makes this bonding possible. Two characteristics, “polarity” and “hydrophilicity”, distinguishing polar and non-polar species, are introduced. Along with the generalized charge, these characteristics are independent arguments of the three-parameter model for liquid phases used in chromatography. The model is applied to describe the interaction of polar molecules in the gas phase with liquid polyethylenee glycol (PEG). Theoretical dependences of PEG polarity and hydrophilicity on the polymer′s molecular mass are derived. The graph of these dependences plotted in “polarity–hydrophilicity” coordinates agrees well chromatography data for characteristics of PEGs used as stationary phases.
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