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RETENTION BEHAVIOUR OF SOME PHENOLS AND ANILINES ON CN-, DIOL-, AND ILICA PRECOATED HPTLC PLATES

The retention behaviour of some phenols and aromatic amines on CN and Diol precoated high-performance thin-layer chromatographic plates was examined using normal-phase eluent systems: polar modifier (2-propanol, ethyl acetate, ethyl methyl ketone, dioxane, tetrahydrofuran or diisopropyl ether) in n-heptane. The results were compared with the retention parameters of investigated compounds obtained in the same eluent systems on bare silica. The results are presented by the comparison of δR M values for pairs of positional isomers and by the R M I vs. R M II relationships of phenols and anilines for CN-silica - silica, diol-silica - silica and CN - diol stationary phases.