Comparison of two liquid crystals as stationary phases in capillary gas chromatography |
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Authors: | D Bélaïdi S Sebih M H Guermouche J P Bayle S Boudah |
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Institution: | (1) Laboratoire de Chromatographie Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediène, El-Alia, Bab-Ezzouar, BP. 32, Alger, Algérie;(2) Laboratoire de Chimie Structurale Organique, Université Paris Sud, Bt. 410, Orsay, France |
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Abstract: | Summary The comparative gas chromatographic behavior has been investigated for two new liquid-crystal stationary phases, 2-(3-chlorobenzyloxy)-3-hexanoxy-4-(4-chlorobenzoyloxy)-4′-(4-methylbenzoyloxy)azobenzene
(denoted 3-Cl) and 2-(3-methylbenzyloxy)-3-hexanoxy-4-(4-chlorobenzoyloxy)-4′-(4-methylbenzoyloxy)azobenzene (denoted 3-CH3). The structures of the main core of the two liquid crystals are the same but they differ by lateral aromatic branch— 3-chlorobenzyloxy
and 3-methylbenzoyloxy. Their thermal properties were established by use of differential scanning calorimetry (DSC) and their
chromatographic separation properties by use of glass capillary columns. Interesting analytical performance was obtained in
the separation of isomeric aromatic compounds, polyaromatic compounds, volatile aroma compounds, andcis andtrans isomers. Separation efficiency was higher for 3-Cl, especially for volatile aroma compounds, light aromatic compounds, and
polyaromatic compounds, although the phases were similar in otherways. |
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Keywords: | Gas chromatography Liquid-crystal phases Differential scanning calorimetry Separation of close-boiling isomers |
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