Russian Chemical Bulletin

, Volume 46, Issue 3, pp 479–482 | Cite as

The influence of molecular conformation ofN-alkylsubstituted six-membered cyclic amines and alkylcyclohexanes on the thermodynamic characteristics of sorption in gas chromatography

  • I. L. Zhuravleva
  • T. E. Kuz'menko
Physical Chemistry


The standard partial molar free energies, enthalpies, and entropies of sorption of the methylene units in the homologous series of alkylcyclohexanes andN-alkylsubstituted sixmembered heterocycles (piperidines, morpholines, and thiomorpholines) were determined on a capillary column with the methylsiloxane OV-101 stationary phase at 70–150°C. A characteristic feature of all series under study is an abnormally high increase in the values of thermodynamic parameters of sorption on going from the methyl to the ethyl homolog. This peculiarity is believed to be associated with the presence of thegauche butane orgauche methylethylamine fragments in the ethyl homolog. Thesegauche fragments have an increased sorption activity under conditions of gas chromatography in comparison with the correspondingtrans form.

Key words

capillary gas chromatography N-n-alkylsubstituted piperidines, morpholines, thiomorpholines, andn-alkylcyclohexanes nomologous series conformation of homologs thermodynamic parameters of sorption of the methylene units 


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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • I. L. Zhuravleva
    • 1
  • T. E. Kuz'menko
    • 1
  1. 1.Institute of Food SubstancesRussian Academy of SciencesMoscowRussian Federation

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