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  • 1
    Electronic Resource
    Electronic Resource
    Shape selectivity in liquid and gas chromatography: Polymeric octadecylsilane (C18) and liquid crystalline stationary phases (1988)
    Springer
    Chromatographia 25 (1988), S. 473-479 
    Details
    ISSN: 1612-1112
    Keywords: Capillary GC ; Reversed-phase LC ; Liquid crystalline phase ; Selectivity ; Octadecylsilane (C18) phase ; Polycyclic aromatic hydrocarbon (PAH) ; Shape selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Octadecylsilane (C18) stationary phases for liquid chromatography (LC), which are prepared by polymeric rather than monomeric phase synthesis, exhibit shape selectivity for isomeric polycyclic aromatic hydrocarbons (PAH) that is similar to the shape selectivity observed for liquid crystalline phases in gas chromatography (GC). Relative retention measurements for several sets of isomeric PAH on a polymeric C18 stationary phase (reversed-phase LC) and liquid-crystalline polysiloxane stationary phase (capillary GC) were compared and correlated with the simple length-to-breadth shape descriptor of the solute. Similar retention behavior was observed for both chromatographic systems. In fact, anomalies in elution order relative to length-to-breadth ratios were generally found to be consistent in both chromatographic systems and could often be ascribed to secondary shape factors (i.e., planarity of the molecule).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324815
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of smectic biphenylcarboxylate ester liquid-crystalline polysiloxane stationary phases for capillary column gas chromatography (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 516-520 
    Details
    ISSN: 0935-6304
    Keywords: Capillary columns ; Gas chromatography, GC ; Stationary phases ; Liquid crystal ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mesomorphic biphenylcarboxylate esters were coupled via flexible aliphatic hydrocarbon spacers to a polysiloxane backbone. The influence of spacer length, percent mesomorphic substitution, and crosslinking of the stationary phase on liquid-crystalline transition temperatures and on chromatographic performance was investigated. Unique selectivity and good efficiency over a wide temperature range for gum and cross-linked liquid-crystalline phases were demonstrated by the separation of various isomeric polycyclic aromatic compounds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080906
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    Paper (German National Licenses)
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