Xi-Bin Dai, Liang-Ying Cai, J. Wen
Jul 12, 2013
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Journal
Liquid Crystals
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.