Abstract
Liquid crystal derivatives of cyclohexylbenzene with an isothiocyanate group have interesting properties with respect to application in displays. However, only trans isomers of these compounds are useful for this purpose, hence separation of the isomers during synthesis and the determination of the amount of the waste cis isomer are necessary. The cis-trans isomers can readily be separated and analysed using short (15 m) glass capillary columns coated with a liquid crystalline stationary phase. A liquid crystal derivative with an isothiocyanate group has been applied. For comparison, some chromatographic separations on Hewlett-Packard Ultra-2 column were performed. Because of the specific retention mechanism of the liquid crystalline phase it was possible to separate isomers with better selectivity and in a shorter time than on the Ultra-2 column. However, as a result of its high efficiency, the Ultra-2 column is better for the chromatographic separation of the other by-products of the synthesis.
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