Abstract
Four series of trans-cyclohexyl-based tolanes, i.e., 4-(trans-4-alkylcyclohexyl)-4'-fluorotolanes, 4-(trans-4-alkylcyclohexyl)-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 (Δ ε) and birefringence (Δ n) of some selected compounds were measured by a guest-host method. All of those compounds studied show relatively high dielectric anisotropy and birefringence.
Original language | English |
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Pages (from-to) | 142-150 |
Number of pages | 9 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 3421 |
DOIs | |
State | Published - 1 Dec 1998 |
Event | Diplay Technologies II - Taipei, Taiwan Duration: 9 Jul 1998 → 11 Jul 1998 |
Keywords
- Fluorinated tolanes
- Nematic liquid crystals
- Trans-cychohexyl based liquid crystals