Abstract
The effect complexation with molecules of β-cyclodextrins (β-CDs) has on the thermodynamic characteristics of adsorption and the selectivity of the separation of aniline and its derivatives on surfaces of a Hypercarb graphite-like material from a water-methanol eluent is studied. The effect the nature of the functional groups present in anilines has on the stability of the sorbate-β-CD complexes being formed is established. An in-depth thermodynamic analysis of the observed macrocyclic effects is performed and the possibility of using the Abraham solvation model for quantitative descriptions of the complexation constants from the viewpoint of the occurrence of different types of intermolecular interactions in a chromatographic system is demonstrated. It is concluded that introducing additions of β-CDs into a water-methanol mobile phase shortens the retentions times and is accompanied by an increase in the selectivity of chromatographic separation in a series of isomeric derivatives of aniline.
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