Synthesis of asymmetric tolane liquid crystals for display application

Kuen Torng Tsay*, Chain-Shu Hsu, Shin Tson Wu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

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 languageEnglish
Pages (from-to)142-150
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3421
DOIs
StatePublished - 1 Dec 1998
EventDiplay Technologies II - Taipei, Taiwan
Duration: 9 Jul 199811 Jul 1998

Keywords

  • Fluorinated tolanes
  • Nematic liquid crystals
  • Trans-cychohexyl based liquid crystals

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