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Synthesis and mesomorphic properties of new azine-type liquid crystals

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Chinese Chemical Letters 2007年第5期18卷 527-529页

作者： Qiang Wei Lin Shi Hui Cao Huai Yang Yan Bin Wang Department of Materials Physics and Chemistry School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A series of symmetrical azine-type liquid crystals were synthesized. The characteristic of these liquid crystals is that they had high clearing point （～320℃） and broad thermal range of nematic phase （～154℃）. I... 详细信息

关键词： Liquid crystal Symmetrical azine Synthesis mesomorphic properties

Synthesis and mesomorphic properties of 4-(4-bromopropyloxy)-4'-(4-alkyloxybenzylidene)anilines

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Chinese Chemical Letters 2012年第7期23卷 769-772页

作者： Guan-Yeow Yeap Yew-Hong Ooi Kenji Kubo Masato M.Ito Liquid Crystal Research Laboratory School of Chemical SciencesUniversiti Sains Malaysia11800 MindenPenangMalaysia Department of Environmental Engineering for Symbiosis Faculty of EngineeringSoka UniversityTokyo 192-8577Japan

This article describes the preparation and liquid crystalline properties of a new homologous series of 4-（4-bromopropyloxy）-4＇- （4-alkyloxybenzylidene）anilines in which the phenyl ring is armed by a bromopropyloxy *** thermal behavior and mesomorphic properties of the synthesized compounds were studied with particular attention given to the correlation between their phase transition temperatures and anisotropic change influenced by molecular *** the members displayed enantiotropic smectic phase except for the homologue with the longest alkyloxy chain（R = C_（18）H_（37））,exhibiting only monotropic characteristic. The presence of bromine atom from the propyloxy side chain is found to be capable of altering and influencing the mesomorphic properties.

关键词： 4-(4-Bromopropyloxy)-4'-(4-alkyloxybenzylidene)anilines mesomorphic properties Enantiotropic smectic DSC

Synthesis and mesomorphic properties of novel tolane-type liquid crystals

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Chinese Chemical Letters 2009年第11期20卷 1283-1286页

作者： Dong Yu Zhao Qing Yong Meng Xiao Peng Cui Huai Yang Department of Materials Physics and Chemistry School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Two series of novel tolane-type liquid crystals （LCs） comprising of hydrogen-bonded organic acids were synthesized. The formation of dimerized H-bond LCs was confirmed by IR spectroscopy, and mesomorphic properties of the LCs were investigated by differential scanning calorimetry （DSC） and polarizing optical microscopy （POM）. It was found that the end groups of the liquid crystals as well as the unsaturated rigid core had effect on the mesomorphic properties.

关键词： Tolane Hydrogen-bonded liquid crystal mesomorphic properties Synthesis

Synthesis and mesomorphic properties of n-butyl-4- [4-((4-n-alkoxyl-tetrafluorophenyl)ethynyl)benzyloxy]benzoates

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Chinese Journal of Chemistry 1995年第6期13卷 515-519页

作者： Wen, JX Yin, HY Chen, Q CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

A homologous series of n-butyl-4-[4-((4-n-alkoxyl-tetrafluorophenyl)ethynyl)benzyloxy] benzoates have been synthesized. Their phase transition temperatures have also measured by polarizing textural observation and con... 详细信息

关键词： liquid crystal synthesis mesomorphic properties

Synthesis and mesomorphic properties of new Schiff base esters with different alkyl chains

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Chinese Chemical Letters 2009年第7期20卷 767-770页

作者： Sie Tiong Ha Lay Khoon Ong Siew Teng Ong Guan Yeow Yeap Joanna Pik Wan Wong Teck Ming Koh Hong Cheu Lin Faculty ofEngineering & Science Universiti Tunku Abdul RahmanJln Genting KlangSetapak 53300 Kuala LumpurMalaysia Faculty of Engineering & Science Universiti Tunku Abdul RahmanJln Genting KlangSetapak 53300 Kuala LumpurMalaysia Liquid Crystal Research Laboratory School of Chemical SciencesUniversiti Sains Malaysia 11800 MindenPenangMalaysia Department of Chemistry University of YorkHeslingtonYork YO10 5DDUnited Kingdom.

A new series of Schiff base esters, 4-（dimethylamino）benzylidene-4＇-alkanoyloxyanilines containing even number of carbons at the end group of the molecules （Cn-1H2n-1COO, n = 6, 8, 10, 12, 14, 16, 18） were synthesized. The present compounds were monotropic liquid crystals. It was also found that the end groups of the molecules had effect on the mesomorphic properties. C 2009 Sie Tiong Ha. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Liquid crystals Schiff base esters Monotropic compounds mesomorphic properties