K. Tsay, Chain‐Shu Hsu, Shin‐Tson Wu
Jun 17, 1998
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Abstract
Four series of trans-cyclohexyl-based tolanes, i.e., 4- (trans-4-alkylcyclohexy)-4'-fluorotolanes, 4-(trans-4-alkyl- cyclohexyl)-3',4'-difluorotolanes, 4-[2-(trans-4-alkyl- cyclo-hexyl)ethyl]-4'-alkyltolanes and fluorinated 4- [2-(trans-4-alkylcyclohexyl)ethyl] tolanes are prepared and characterized. All the obtained compounds display nematic liquid crystalline phases. The results demonstrate that incorporation of a cyclohexyl ring in the mesogen core structure leads to form a wide temperature range of mesophase. However it also increases the tendency to form a smectic phase. The dielectric anisotropy and birefringence of some selected compounds were measured by a guest-host method. All of those compounds studied show relatively high dielectric anisotropy and birefringence.