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Synthesis of functionalized triphenylene discotic liquid crystals and the influence of unsaturated periphery on mesomorphism 被引量:1
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作者 ZHAO KeQing ZHOU Hui +4 位作者 YU WenHao HU Ping WANG BiQin MONOBE Hirosato SHIMIZU Yo 《Science China Chemistry》 SCIE EI CAS 2011年第10期1576-1583,共8页
Twelve triphenylene discogens with unsaturated periphery (abbreviated as C18H6(OC5H11)6-x(OR)x(x=1,2,3), R=-C3H6CH==CH2(a),-C3H6C≡CH(b),-C2H4OCH==CH2(c)) were synthesized and characterized. The thermotropic liquid cr... Twelve triphenylene discogens with unsaturated periphery (abbreviated as C18H6(OC5H11)6-x(OR)x(x=1,2,3), R=-C3H6CH==CH2(a),-C3H6C≡CH(b),-C2H4OCH==CH2(c)) were synthesized and characterized. The thermotropic liquid crystal prop-erties were studied by using polarized optical microscopy, differential scanning calorimetry and X-ray diffractometry. The results showed that all triphenylenes exhibited hexagonal columnar mesophase. The thermotropic studies showed that series a (alkene periphery) exhibited higher clearing points than the corresponding series b (alkyne periphery), while series c (vinyloxy periphery) exhibited highest clearing points and widest mesophase temperature ranges. We also found that the symmetric discogens sym-C18H6(OC5H11)3(OR)3 displayed higher melting points and clearing points than the asymmetric ones asym-C18H6(OC5H11)3(OR)3. 展开更多
关键词 discotic liquid crystal TRIPHENYLENE functional periphery hexagonal columnar mesophase mesomorphism engineering
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Phase behaviors of binary mixtures composed of electron-rich and electron-poor triphenylene discotic liquid crystals 被引量:1
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作者 安玲玲 景敏 +3 位作者 肖波 白小燕 曾庆祷 赵可清 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期143-148,共6页
Disk-like liquid crystals(DLCs) can self-assemble to ordered columnar mesophases and are intriguing onedimensional organic semiconductors with high charge carrier mobility.To improve their applicable property of mes... Disk-like liquid crystals(DLCs) can self-assemble to ordered columnar mesophases and are intriguing onedimensional organic semiconductors with high charge carrier mobility.To improve their applicable property of mesomorphic temperature ranges,we exploit the binary mixtures of electronic donor-acceptor DLC materials.The electron-rich2,3,6,7,10,11-hexakis(alkoxy)triphenylenes(C4,C6,C8,C10,C12) and an electron-deficient tetrapentyl triphenylene-2,3,6,10-tetracarboxylate have been prepared and their binary mixtures have been investigated.The mesomorphism of the1:1(molar ratio) mixtures has been characterized by polarizing optical microscopy(POM),differential scanning calorimetry(DSC),and small angel x-ray scattering(SAXS).The self-assembled monolayer structure of a discogen on a solid-liquid interface has been imaged by the high resolution scanning tunneling microscopy(STM).The match of peripheral chain length has important influence on the mesomorphism of the binary mixtures. 展开更多
关键词 binary mixtures discotic liquid crystals triphenylene mesomorphism
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Phase Transition Investigations of a Series of Aromatic Naphthalene-2-yl-4-(Alkoxy) Benzoate and Naphthalene-1-yl-4-(Alkoxy) Benzoate Materials
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作者 Wajdi Michael Zoghaib Carlo Carboni +4 位作者 Mohammed Elias Molla Samiya Al-Mahrezi Turkiya Al-Shahumi Sanaa Al-Badi Muna Al-Farsi 《World Journal of Condensed Matter Physics》 CAS 2022年第1期1-7,共7页
The mesogenic properties of a homologous series of aromatic ester materials are investigated. Single tail and double tail materials were synthesized to compare with other series we prepared and published earlier. The ... The mesogenic properties of a homologous series of aromatic ester materials are investigated. Single tail and double tail materials were synthesized to compare with other series we prepared and published earlier. The phase sequences and transition temperatures were obtained by polarized light microscopy and differential scanning calorimetry. Only the single tail materials with the ester attached to naphthalene at position 2 display mesogenicbehavior. Two materials (ZH 29 & ZH 32) possess a monophasic nematic phase and another two materials (ZH 14 & ZH 35) display biphasic nematic and smectic (A) phases. 展开更多
关键词 Liquid Crystals mesomorphism Calamitic NEMATIC Smectic A Polarized Optical Microscopy Differential Scanning Calorimetry
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Synthesis and mesomorphic properties of novel tolane-type liquid crystals 被引量:1
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作者 Dong Yu Zhao Qing Yong Meng Xiao Peng Cui Huai Yang 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第11期1283-1286,共4页
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 ... 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. 展开更多
关键词 TOLANE Hydrogen-bonded liquid crystal Mesomorphic properties SYNTHESIS
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New mesogenic Schiff base esters comprising benzothiazole moiety:Synthesis and mesomorphic properties
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作者 Sie Tiong Ha Teck Ming Koh +4 位作者 Guan Yeow Yeap Hong Cheu Lin Jun Kit Beh Yip Foo Win Peng Lim Boey 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第9期1081-1084,共4页
A homologous series of Schiff base esters, 6-methoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles, compris- ing a benzothiazole moiety as the core was synthesized. All the members of this series exhibite... A homologous series of Schiff base esters, 6-methoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles, compris- ing a benzothiazole moiety as the core was synthesized. All the members of this series exhibited an enantiotropic nematic phase. The azomethine linkage along with the lateral hydroxyl and terminal methoxyl groups were found to exert an effect on the mesomorphic properties. 2009 Sie Tiong Ha. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 展开更多
关键词 Schiff bases BENZOTHIAZOLES MESOMORPHIC NEMATIC Structure-liquid crystal property relationship
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Synthesis and mesomorphic properties of new azine-type liquid crystals
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作者 Qiang Wei Lin Shi Hui Cao Huai Yang Yan Bin Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第5期527-529,共3页
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... 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℃). It was also found that the end groups of the liquid crystals had effect on the mesomorphic properties. 展开更多
关键词 Liquid crystal Symmetrical azine SYNTHESIS Mesomorphic properties
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Synthesis and mesomorphic properties of new Schiff base esters with different alkyl chains
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作者 Sie Tiong Ha Lay Khoon Ong +4 位作者 Siew Teng Ong Guan Yeow Yeap Joanna Pik Wan Wong Teck Ming Koh Hong Cheu Lin 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第7期767-770,共4页
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 synthe... 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. 展开更多
关键词 Liquid crystals Schiff base esters Monotropic compounds Mesomorphic properties
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Syntheses and Mesomorphic Properties of 2-(4'-Alkoxyphenyl)-6-Substituted Benzothiazoles
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作者 LU Zhong-e, MA Ying-liang and CHEN Ke-qian (Department of Chemistry, Suzhou University, Suzhou, 215006)SUN Zheng-min (Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1992年第2期164-168,共5页
Introduction Liquid crystals without a double bond bridge between two rings in the linear molecule are more stable chemically and photochemically. Alkyl cyanobiphenyl was synthesized by Richard in 1973. Later, liquid ... Introduction Liquid crystals without a double bond bridge between two rings in the linear molecule are more stable chemically and photochemically. Alkyl cyanobiphenyl was synthesized by Richard in 1973. Later, liquid crystals with the strcture of phenylcyclohexane and cyclohexylcyclohexane also appeared. But the liquid crystals 展开更多
关键词 Liquid crystal Mesomorphic state BENZOTHIAZOLE
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Mesomorphic Characteristics of Induced Chiral Nematic Phase of[Smectic LCP,PS(4BC/DM)/Nematic LC,E7/Chiral Dopant,CB-15]-Ternary Composite System
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作者 YANG Huai Hrotsugu Kikuchi +1 位作者 CHENG Xin-Fang Tisato Kajiyama 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1997年第2期71-76,共6页
The phase transition behavior and aggregating states of [smectic LCP, PS(4BC/DM)/nematic LC, E7/chiral dopant, CB 15] ternary composite system were investigated on the basis of differential scanning calorimetry (DSC)... The phase transition behavior and aggregating states of [smectic LCP, PS(4BC/DM)/nematic LC, E7/chiral dopant, CB 15] ternary composite system were investigated on the basis of differential scanning calorimetry (DSC) measurement, polarizing optical microscopy (POM) observation and wide angle X ray diffraction (WAXD) patterns. It was demonstrated that if the weight ratio of the chiral dopant was fixed as 4.8wt%, an induced chiral nematic (N *) phase existed in the ternary system when PS(4BC/DM) ratio was below 47.6 wt%. Moreover, smectic like long range ordering appeared in the induced N * phase in a certain temperature range just above the smectic A(S A) N * phase transition when PS(4BC/DM) ratio was between 19.1wt% and 47.6wt%. 展开更多
关键词 MESOMORPHIC Induced chiral nematic phase DOPANT
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Unicity Theorems of Mesomorphic Functions with Three Weighted Sharing Values
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作者 WANG Xin-li CAO Zhang-long 《Chinese Quarterly Journal of Mathematics》 CSCD 2012年第1期110-116,共7页
In this paper,with the idea of weighted sharing values,we deal with the problem of uniqueness of mesomorphic functions sharing three weighted values.We obtain some theorems which improve the results of H X Yi and W R ... In this paper,with the idea of weighted sharing values,we deal with the problem of uniqueness of mesomorphic functions sharing three weighted values.We obtain some theorems which improve the results of H X Yi and W R L. 展开更多
关键词 mesomorphic functions weighted sharing values unicity theorem
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Synthesis and Characterization of Mesomorphic Behaviour of New Mesogenic Compounds Incorporating Cholesteryl Ester Moiety Connected to 1,3,4-Oxadiazole
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作者 Ivan H. R. Tomi Maha T. S. Al-Mahdawi +2 位作者 Isam A. Latif Fawwaz I. Khlili Ammar H. AI-Dujaili 《Journal of Chemistry and Chemical Engineering》 2011年第10期946-955,共10页
The synthesis and characterization of new series of liquid crystals containing cholesteryl moiety connected via an ester linkage to 1,3,4-oxadiazole are reported. The molecular structures of the intermediates and targ... The synthesis and characterization of new series of liquid crystals containing cholesteryl moiety connected via an ester linkage to 1,3,4-oxadiazole are reported. The molecular structures of the intermediates and target compounds were confirmed by elemental analyses and FT-IR, ^1H NMR and mass spectrometry. The mesomorphic behaviors were investigated by polarizing optical microscopy (POM) attached with hot stage and differential scanning calorimetry (DSC). Enantiotropic smectic 1, smectic A, blue phase and cholesteric mesophases are exhibited by the newly synthesized compounds. 展开更多
关键词 MESOMORPHIC 1 3 4-oxadiazole cholesteryl ester cholesteric phase smectic phase
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Mesomorphic Studies on a Series of Nickel (II) Centered Aromatic Complexes Displaying Liquid Crystalline Phases
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作者 Wajdi Michael Zoghaib Carlo Carboni +2 位作者 Mohammed Elias Molla Turkiya Al-Shahumi Raya Al-Yazeedi 《World Journal of Condensed Matter Physics》 CAS 2022年第3期27-37,共11页
Two new series (A & B) of three materials each based on the aroyl hydrazinato-nickel (II) complex were synthesized and characterized. The core molecule in these series consists of two 4-benzoyloxy benzylidene moie... Two new series (A & B) of three materials each based on the aroyl hydrazinato-nickel (II) complex were synthesized and characterized. The core molecule in these series consists of two 4-benzoyloxy benzylidene moieties and two benzene rings attached at the azomethine moiety. These latter benzene rings have one or two alkoxy chains comprised of either 10, 12, 16 or 18 carbon atoms. The characterization of these two series by polarized optical microscopy and differential scanning calorimetry is described herein. Upon cooling from the Isotropic phase, three of the six materials display a monophasic columnar phase and the other three possess a biphasic nematic and columnar phases. Upon heating, all six materials have a clearance point at high temperatures without displaying mesomorphic behavior. In series B mesogens, it was observed that the longer the hydrocarbon tail length, the lower the clearance point. 展开更多
关键词 COLUMNAR MESOMORPHIC NEMATIC DISCOTIC METALLOMESOGENS Polarized Optical Microscopy Differential Scanning Calorimetry
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Synthesis and mesomorphic properties of n-butyl-4- [4-((4-n-alkoxyl-tetrafluorophenyl)ethynyl)benzyloxy]benzoates 被引量:2
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作者 Wen, JX Yin, HY Chen, Q 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1995年第6期515-519,共5页
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... 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 confirmed by DSC. 展开更多
关键词 liquid crystal SYNTHESIS mesomorphic properties
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Heterocyclic benzoxazole-based liquid crystals:Synthesis and mesomorphic properties 被引量:1
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作者 Sie Tiong Ha Kok Leei Foo +3 位作者 Ramesh T.Subramaniam Masato M.Ito S.Sreehari Sastry Siew Teng Ong 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第10期1191-1194,共4页
New Schiff base liquid crystals containing benzoxazole core and alkanoyloxy chain at the end group of the molecules (C_(n-1)H_(2n-1)COO-,n=14,16,18) was synthesized.The present compounds are enantiotropic smecti... New Schiff base liquid crystals containing benzoxazole core and alkanoyloxy chain at the end group of the molecules (C_(n-1)H_(2n-1)COO-,n=14,16,18) was synthesized.The present compounds are enantiotropic smectic A liquid crystals.It was also found that the end groups of the molecules and polar chloro substituent at the benzoxazole fragment had effect on the mesomorphic properties. 展开更多
关键词 Schiff bases BENZOXAZOLES MESOMORPHIC Smectic A Structure-property relationship
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Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail 被引量:1
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作者 Xiao Dong Li Mao Sheng Zhan Kai Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第9期1111-1114,共4页
Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N(1,7)-n-OPIMB and N(1,7)-n-SP1MB (n = 20, 22), respectively, were synth... Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N(1,7)-n-OPIMB and N(1,7)-n-SP1MB (n = 20, 22), respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N(1,7)-n-OPIMB, N(1,7)-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1,7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence. 展开更多
关键词 Bent-shaped Liquid crystal Alkylthio tail Mesomorphic behaviour
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Synthesis and Mesomorphic Properties of Some ω'-Alkoxy-ω-benzoxypolyfluorotolane Compounds 被引量:1
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作者 秦川 荣国斌 +1 位作者 余洪斌 闻建勋 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2006年第7期910-916,共7页
Abstract Four homologue series of 4-cyano- and 4-nitro-substituted benzoate-tolanes were synthesized and characterized by IR, NMR, MS spectra and elemental analysis. Their phase transition behaviors were investigated ... Abstract Four homologue series of 4-cyano- and 4-nitro-substituted benzoate-tolanes were synthesized and characterized by IR, NMR, MS spectra and elemental analysis. Their phase transition behaviors were investigated by DSC and polarized optical microscope. The effects on the mesomorphic properties of different positions of the perfluorophenyl in the molecular core unit, the terminal cyano-substituted systems and the terminal nitro-substituted ones were discussed. 展开更多
关键词 benzoate-tolane mesomorphic property perfluorophenylene
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Synthesis and mesomorphic properties of 4-(4-bromopropyloxy)-4'-(4-alkyloxybenzylidene)anilines 被引量:1
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作者 Guan-Yeow Yeap Yew-Hong Ooi +1 位作者 Kenji Kubo Masato M.Ito 《Chinese Chemical Letters》 SCIE CAS CSCD 2012年第7期769-772,共4页
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 bromopropylox... 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 chain.The 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 structure.All 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. 展开更多
关键词 4-(4-Bromopropyloxy)-4'-(4-alkyloxybenzylidene)anilines Mesomorphic properties Enantiotropic smectic DSC
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New mesomorphic benzothiazol derivatives: Synthesis and characterization 被引量:1
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作者 Teck-Ming Koh Sie-Tiong Ha +1 位作者 Guan-Yeow Yeap Hong-Cheu Lin 《Chinese Chemical Letters》 SCIE CAS CSCD 2013年第10期926-928,共3页
In this paper, the synthesis of new mesomorphic benzothiazolyl derivatives, 6-ethoxy-2-[4-(4- alkyloxybenzoyloxy)benzylidenamino]benzothiazoles, is presented. The structures of the title compounds were elucidated us... In this paper, the synthesis of new mesomorphic benzothiazolyl derivatives, 6-ethoxy-2-[4-(4- alkyloxybenzoyloxy)benzylidenamino]benzothiazoles, is presented. The structures of the title compounds were elucidated using spectroscopic techniques, such as FT-IR, NMR (1H and 13C), elemental analysis and El-MS. The mesomorphic behaviours of these compounds were determined by differential scanning calorimetric and polarizing optical microscopic techniques. Compounds exhibited nematic and tilted smectic phases upon heating from crystal phase. An obvious odd-even effect was observed in this homologous series. 展开更多
关键词 Benzothiazole Nematic Smectic C Mesomorphic
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Synthesis and mesomorphic properties of trifluorobenzoate liquid crystal 被引量:1
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作者 杨永刚 闻建勋 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1999年第1期69-79,3,共11页
Four series of trifluorobenzoate liquid crystals have been synthesized. Their phase transition temperatures have been also measured by texture observation in a polarizing microscope and confirmed by DSC. The influence... Four series of trifluorobenzoate liquid crystals have been synthesized. Their phase transition temperatures have been also measured by texture observation in a polarizing microscope and confirmed by DSC. The influence of the lateral fluoro-substitution and triple bond has been also discussed. 展开更多
关键词 Liquid crystal SYNTHESIS mesomorphic properties
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