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  • 1
    Electronic Resource
    Electronic Resource
    The selectivity of crown ether polysiloxane stationary phases (1993)
    Springer
    Chromatographia 35 (1993), S. 33-37 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Crown ether polysiloxane phases ; Selectivity mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The phase recognition mechanism of nine groups of position isomers on four crown ether polysiloxanes, OV-1701 and PEG 20M has been investigsated by measuring various thermodynamic parameters. The high selectivity of crown ether polysiloxane phases is due to hydrogen bonding and the extent of fitting between the analytes and the crown ethe cavity. The effects on selectivity of cavity size, heteroatoms and substituent groups on the crown ether are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278553
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and gas chromatographic characterization of dibenzyl crown ether stationary phases (1993)
    Springer
    Chromatographia 37 (1993), S. 374-380 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Crown ether polysiloxane phases ; Capillary columns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two crown ethers, di(tert-butylbenzo)-propyl-15-crown-5 polysiloxane (PSO-DTB-15C5) and dibenzo-propyl-15-crown-5 polysiloxane (PSO-DB-15C5) have been synthesized and coated onto fused-silica capillary columns. The chromatographic characteristics, including column efficiency, polarity, phase transition temperature, operating temperature range and selectivity, were studied. Excellent selectivity was obtained for the separation of polar position isomers, especially phenol and dinitrotoluene isomers. The separation mechanism is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272251
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    Paper (German National Licenses)
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