Liquid crystals of some new tolane derivatives containing a 1,2-ethylene linkage |
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Authors: | Y Goto K Kitano T Ogawa |
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Institution: | Chisso Petrochemical Corporation , 5-1 Goi Kaigan, Ichihara, Chiba , Japan , 290 |
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Abstract: | Abstract Three types of nematogenic compound, 4-2-(trans-4-alkylcyclohexyl)ethyl]-4′-alkyltolanes, 2-fluoro-4-2-(trans-4-alkylcyclohexyl)ethyl]-4′-alkyltolanes and 4-2-(trans-4-alkylcyclohexyl)ethyl]-4′-halogenotolanes, have been synthesized and their transition temperatures and enthalpies determined. Their bulk viscosity and birefringence have been estimated from those of mixtures with other liquid-crystalline compounds. These compounds have been found to be excellent materials for twisted nematic displays, because of their wide nematic temperature range, high birefringence (Δn = 0·26), and low viscosity (η = 21 cP at 20°C). Several related compounds having other central linkages, namely -CH2O-, a single bond or -COO-, in place of the 1,2-ethylene group, have also been studied. |
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