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Gas chromatographic retention indices for N-substituted amino s-triazines on capillary columns - Part IV: Influence of column polarity on retention index

Mijin Dušan Ž. (Department of Organic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11001 Belgrade)
Antonović Dušan G. (Department of Organic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11001 Belgrade)
Bončić-Caričić Gordana (Department of Organic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11001 Belgrade)
Jovanović Bratislav Ž. (Department of Organic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11001 Belgrade)
Rajković Olga S. (High Chemical School, 37001 Kruševac, Serbia and Montenegro)

The retention index increment for the addition of a methylene group to the alkyl group of an analyte molecule is shown to be lower than 100 i.u. for N-substituted amino s-triazines. In temperature programmed gas chromatography, a linearly interpolated retention index I, determined from the linear regression equation, I = AZ + (GRF)z, with the number of atoms (Z) in the molecule as variable, was used to describe the retention of 25 N-substituted amino s-triazines, on DB-1, DB-5 and DB-WAX capillary columns divided into five series according to the similarity of the alkyl groups in the particular series. In the above equation, A is the linear regression coefficient or the retention index increment per atom addition, Z the number of C,N and Cl atoms in the molecule, and (GRF)z the group retention factor or functionality constant for functional groups in the molecule, based on the number Z. It is possible to estimate the retention indices of an unknown member of the series from the Z, A and (GRF) values.

Keywords: retention indices, retention index increment, s-triazines, group retention factors.