Thermodynamic evaluation of character of interaction of aromatic hydrocarbons with polyethylene glycol in analysis in glass-capillary columns treated with KF or Na3PO4
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Glass-capillary columns with polyethylene glycol treated with KF or Na3PO4 are highly efficient and selective in the separation of benzene-series hydrocarbons. The presence of the salts does not influence the interaction of the hydrocarbons with the stationary phase.
A sharp increase has been found in the energy of dispersion interaction of aromatic hydrocarbon molecules with the stationary phase when the methyl substituents are in vicinal positions on the aromatic ring, and this increase has been estimated thermodynamically. An analysis of the literature data has made it possible to extend this conclusion to series of aliphatic and cyclic hydrocarbons with vicinal methyl groups. An increase of the contribution ofπ-complex formation to the energy of dissolution is manifested in the case of substituted benzenes containing more than three methyl groups.
KeywordsMethyl Benzene Polyethylene Hydrocarbon Glycol
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