CHARGE-TRANSFER LIQUID-CHROMATOGRAPHY OF AROMATIC-HYDROCARBONS AND POLYARYL ALKANES

The chromatographic properties of LiChrosorb Si 60 silica gel, with chemically bonded 3-(2,4-dinitranilino)propyl (DNAP) groups (0.89 mequiv./g), were examined in the high-performance liquid chromatography of a series of polynuclear aromatic hydrocarbons (PAHs), alkyl aromatic hydrocarbons and polyaryl alkanes. The capacity factors, k′CTC, of solutes decreased rapidly with increasingly choloroform content in the n-heptane-chloroform mobile phase. A linear correlation was found between the terms 1/(log k′CTC + 1.28) and the vertical ionization potentials, IvD, of medium-sized PAHs, providing strong evidence for charge-transfer interactions of the solutes with the DNAP groups. Data are presented reflecting significant differences in the behaviour of PAHs in charge-transfer, adsorption elution and reversed-phase chromatography. © 1979.