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Crystals 2013, 3(2), 339-349; doi:10.3390/cryst3020339

Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine

Department of Chemistry, Tamkang University, Tamsui 251, Taiwan
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Received: 23 March 2013 / Revised: 6 May 2013 / Accepted: 20 May 2013 / Published: 30 May 2013
(This article belongs to the Special Issue Advances in Liquid Crystals)
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Abstract

Fluoro substitution in thermotropic liquid crystals provides a general way of modifying the properties of a parent system. Transition temperatures, mesophase types and other physical properties can be affected by fluoro substitution, so that frequently the behaviors of the parent compound can be manipulated and improved in a predictable manner. This paper discusses the effects of a fluoro substitution in each side-arm of 1,2,4,5-tetrakis((4-(alkoxy)phenyl)ethynyl)benzenes on the resulting mesomorphic properties characterized by optical polarizing microscopy and differential scanning calorimetry. Without any fluoro-substituted side-arms, longer chain-length leads to a wider nematic temperature range on cooling. Incorporation of a fluoro substitution in each side-arm induces the formation of a lamellar suprastructure, lowers transition temperatures and results in a wider mesophase temperature range on cooling. View Full-Text
Keywords: 1,2,4,5-tetraalkoxyphenylethynylbenzene (TPEB); cruciform-shaped; mesophase; smectic phase; nematic phase 1,2,4,5-tetraalkoxyphenylethynylbenzene (TPEB); cruciform-shaped; mesophase; smectic phase; nematic phase
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lin, Y.-H.; Ezhumalai, Y.; Yang, Y.-L.; Liao, C.-T.; Hsu, H.-F.; Wu, C. Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine. Crystals 2013, 3, 339-349.

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