Synthesis of asymmetric tolane liquid crystals for display application

Kuen Torng Tsay; Chain-Shu Hsu; Shin Tson Wu

doi:10.1117/12.311057

Synthesis of asymmetric tolane liquid crystals for display application

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

^*Corresponding author for this work

Department of Applied Chemistry

Research output: Contribution to journal › Conference article › peer-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 language	English
Pages (from-to)	142-150
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3421
DOIs	https://doi.org/10.1117/12.311057
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

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10.1117/12.311057

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title = "Synthesis of asymmetric tolane liquid crystals for display application",

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.",

keywords = "Fluorinated tolanes, Nematic liquid crystals, Trans-cychohexyl based liquid crystals",

author = "Tsay, {Kuen Torng} and Chain-Shu Hsu and Wu, {Shin Tson}",

year = "1998",

month = dec,

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doi = "10.1117/12.311057",

language = "English",

volume = "3421",

pages = "142--150",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

issn = "0277-786X",

publisher = "SPIE",

note = "null ; Conference date: 09-07-1998 Through 11-07-1998",

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TY - JOUR

T1 - Synthesis of asymmetric tolane liquid crystals for display application

AU - Tsay, Kuen Torng

AU - Hsu, Chain-Shu

AU - Wu, Shin Tson

PY - 1998/12/1

Y1 - 1998/12/1

N2 - 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.

AB - 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.

KW - Fluorinated tolanes

KW - Nematic liquid crystals

KW - Trans-cychohexyl based liquid crystals

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EP - 150

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

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