ISSN:
0935-6304
Keywords:
Gas chromatography
;
Capillary columns, glass
;
Packed columns
;
Free energy of sorption
;
Intramolecular interactions
;
Intermolecular interactions
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Variation of the values of free energy of sorption of the methylene unit has been studied in the homologous series of n-alkyl methyl ketones, n-alkyl butyl ketones, n-alkyl acetates, and methyl esters of carboxylic acids, depending on the homologue number and the temperature of analysis. The experiment was carried out on a capillary column with a thick film of immobilized Silicone SE-54 and on packed columns with OV-210 and Silar-10C. An intramolecular donor-acceptor interaction between neighboring CH3— and C=O groups is assumed to be the reason for anomalously high values of free energy of sorption of the first CH2 unit in the series: RmC(O)OCH3, RmC(O)CH3, and RmC(O)C4H9. The anomaly disappeared in stationary phases containing strongly electronegative —CF3 and —CN groups because of specific inter molecular interactions.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jhrc.1240130110
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