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  • 1
    Electronic Resource
    Electronic Resource
    Intra- and intermolecular interactions in the first members of homologous series of carbonyl containing compounds in gas chromatography (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 47-51 
    Details
    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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  • 2
    Electronic Resource
    Electronic Resource
    Inequality of temperature increments ofn-alkane homologs as one of the reasons for the nonlinear variation of sorption parameters of substances in temperature-programmed gas chromatography (1994)
    Springer
    Russian chemical bulletin 43 (1994), S. 591-594 
    Details
    ISSN: 1573-9171
    Keywords: temperature-programmed gas chromatography ; temperature increments forn-alkanes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract GC behavior of C6-C17 n-alkanes has been investigated at different temperatures of isothermal analysis and under temperature programming conditions using two capillary columns coated with OV-101 and OV-351 stationary phases. Temperature increments have been calculated for the homologs and their inequality has been demonstrated for each member of then-alkane series. It was shown that the nonlinear individual temperature variation of the energy of dispersive interaction ofn-alkane homologs with the stationary phase, which was observed under isothermal conditions, may be one of the main reasons for the nonlinear change in sorption parameters ofn-alkanes in temperature-programmed gas chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699830
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