DETERMINATION OF THERMODYNAMIC FUNCTIONS OF SORPTION FOR CYCLOHEXYL-N-ALKANES, PIPERIDYL-N-ALKANES, MORPHOLYL-N-ALKANES, AND THIOMORPHOLYL-N-ALKANES BY CAPILLARY GAS-LIQUID-CHROMATOGRAPHY
Rv. Golovnya et al., DETERMINATION OF THERMODYNAMIC FUNCTIONS OF SORPTION FOR CYCLOHEXYL-N-ALKANES, PIPERIDYL-N-ALKANES, MORPHOLYL-N-ALKANES, AND THIOMORPHOLYL-N-ALKANES BY CAPILLARY GAS-LIQUID-CHROMATOGRAPHY, Russian chemical bulletin, 45(8), 1996, pp. 1925-1927
The values of partial molar free energy (Delta G), enthalpy (Delta H),
and entropy (Delta S) of sorption in the homologous series of N-alkyl
piperidines, N-alkylmorpholines, N-alkylthiomorpholines, and alkylcycl
ohexanes were determined. It was found that the free energy of sorptio
n is determined to a greater extent by the enthalpy term than by the e
ntropy one. The free energy of sorption of the first homolog decreases
when the n-alkyl chain is attached directly to the carbon atom of the
cycle and increases in the case of N-alkylsubstituted heterocycles. T
he influence of the heteroatom nature on intermolecular interactions o
f homologs with the nonpolar stationary phase was quantitatively estim
ated on the basis of thermodynamic data.