The effect of lateral fluoro-substitution on the liquid crystal behaviour of some 4'-alkylphenylethyl- and trans-4'-alkylcyclohexylethyl-4,4'-disubstituted biphenyls |
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Authors: | G. W. Gray D. Lacey J. E. Stanton K. J. Toyne |
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Affiliation: | Department of Chemistry , The University , Hull, HU6 7RX, England |
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Abstract: | Abstract The preparation of several 4'-alkylphenylethyl- and trans-4'-alkylcyclohexyl-ethyl-4,4'-disubstituted biphenyls and their 2-fiuoro derivatives is described and their transition temperatures are reported. The effect on the transition temperatures caused by the replacement of a cyclohexane ring by a benzene ring and the effect of fluoro-substitution on nematic, smectic A and smectic B thermal stabilities is discussed. In these systems, and in others, when the lateral fluoro-substituent points towards the longer terminal aliphatic unit (alkyl or alkylcyclo-hexylethyl) it causes a greater depression of smectic properties. |
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