SORPTION CHARACTERISTICS OF N-ALKYLIMIDAZOLES UNDER CONDITIONS OF CAPILLARY CHROMATOGRAPHY

The retention indices for N-n-alkyl (C-1-C-5) substituted imidazoles w ith Me, Et, Pr, and Bu groups in different positions of the cycle were determined. Two capillary columns with OV-1O1/KF and PEG-40M/KF were used. The two nitrogen atoms of the imidazole molecule were shown to h ave different effects on the contributions of the alkyl groups to the retention indices. The maximum and minimum contributions are observed for the substituents at the 5 and 4 positions of the imidazole cycle, respectively. An increase in a size of the CmH2m+1 substituent attache d to the N(1) atom has a notable effect only on the contributions of t he alkyl groups at the 2 and 5 positions. The retention indices values for a homologous series with an n-alkyl group attached to the N or C( 2) atom were described by a universal type equation. The obtained equa tions can be used for predicting the retention indices of new homologs and identification of N-alkylimidazoles in complex mixtures.