ISSN:
1573-9171
Schlagwort(e):
capillary gas-liquid chromatography
;
N-alkyl-substituted piperidines
;
morpholines and thiomorpholines
;
cyclohexyl-n-alkanes
;
partial molar free energy
;
enthalpy and entropy of sorption
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The values of partial molar free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) of sorption in the homologous series ofN-alkylpiperidines,N-alkylmorpholines,N-alkyl thiomorpholines, and alkylcyclohexanes were determined. It was found that the free energy of sorption is determined to a greater extent by the enthalpy term than by the entropy one. The free energy of sorption of the first homolog decreases when then-alkyl chain is attached directly to the carbon atom of the cycle and increases in the case ofN-alkylsubstituted heterocycles. The influence of the heteroatom nature on intermolecular interactions of homologs with the nonpolar stationary phase was quantitatively estimated on the basis of thermodynamic data.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01457778
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