The synthesis and mesomorphic properties of 4-n-alkoxyphenyl 4-[(4-n-alkoxy-2,3,5,6-tetrafluorophenyl)ethyl]benzoates |
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| Authors: | Xiuwen Dai Liangzhen Cai |
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| Institution: | School of Chemistry and Molecular Engineering , East China University of Science and Technology , Shanghai , PR China |
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| Abstract: | 4-n-Alkoxyphenyl4-(4-n-alkoxy-2,3,5,6-tetrafluorophenyl)ethynyl]benzoates (compound A) are synthesised by a convenient method. These compounds exhibit only enantiotropic nematic phases and have very high clearing points. These compounds (As) can be transformed into corresponding ethane derivatives, via hydrogenation using a palladium catalyst (Pd/C), which exhibit monotropic nematic phases. The effect of the ethylene bridge (–CH2CH2–) on the mesomorphic behaviour is discussed. |
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| Keywords: | liquid crystal fluoro-substituted tolane monotropic nematic phase ethylene linking group bridge |
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