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Effects of substitution and terminal groups for liquid-crystallinity enhanced luminescence of disubstituted polyacetylenes carrying chromophoric terphenyl pendants

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中国科学：化学英文版 2010年第6期53卷 1302-1315页

作者： ZHOU Dan,CHEN YiWang,CHEN Lie,LI Fan,NIE HuaRong & YAO Kai Institute of Polymers/Department of Chemistry,Nanchang University,Nanchang 330031,China Institute of Polymers/Department of Chemistry Nanchang University Nanchang China

Liquid-crystalline and light-emitting poly(2-alkyne)s containing terphenyl cores with hexamethyleneoxy spacers,and cyano or n-propoxy tails -[CH3C=C(CH2)6O-terphenyl-R]n-,where R=CN,CH3PA6CN,R=OCH2CH2CH3,CH3PA6OPr,were *** effects of the substitution and terminal groups on the properties,especially the mesomorphic and optical properties of the polymers,were *** disubstituted acetylene monomers (CH3A6CN,CH3A6OPr) were pre- pared through multistep reaction routes and were polymerized by WCl6-Ph4Sn in good yields (up to 82%).All the monomers and CH3PA6CN exhibited the enantiotropic SmA phase with a monolayer arrangement at elevated temperatures,whereas CH3PA6OPr formed a bilayer SmAd packing *** excitation at 330 nm,strong UV and blue emission peaks at 362 and 411 nm were observed in CH3PA6OPr and CH3PA6CN,*** luminescent properties of CH3PA6CN and CH3PA6OPr have been improved by introducing the methyl substituted group,and the quantum yield of the polymer with cyano tail CH3PA6CN (φ= 74%) was found to be higher than that of CH3PA6OPr (φ= 60%).Compared to polyacety- lene parents,both CH3PA6OPr and CH3PA6CN showed a narrower energy *** demonstrated that the electrical con- ductivities of polyacetylenes could be enhanced by attaching appropriate pendants to the conjugated polyene backbones.

关键词： disubstituted polyacetylenes liquid crystallinity phase transition photoluminescence

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Solid-liquid phase diagram of disubstituted benzene systems

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Science China Chemistry 1995年第3期38卷 280-287页

作者：黑恩成刘国杰 Department of Chemistry East China University of Science and Technology Shanghai 200237 China

The cooling curves of different compositions of the systems of ortho-chlorotoluene/para-chlorotoluene and ortho-nitrochlorobenzene/para-nitrochlorobenzene are carefully determined by the thermal analysis method. The crystals obtained are also tested. The conclusion that both systems are of simple eutectic diagram but not the solid solution diagram with a minimum melting point is confirmed. The characteristics of the diagram are explained according to the physical and thermodynarmc properties of the components.

关键词： disubstituted benzene phase diagram thermal analysis.

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A　NEW　SYNTHESIS　OF　1,4-disubstituted　AZO　UREAS

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Chinese Chemical Letters 1996年第5期7卷 393-394页

作者： Jian Ping LI Jin Ye WANG Dong Lan MA Yu Lu WANG (Department of Chemistry, Henan Normal University, Xinxiang, 453002)(photobiology Group, photodynamics Research Center, The Institute of Physical and Chemical Research, 19-1399 Koeji, Nagamachi, Aoba-ku, Department of Chemistry Henan Normal University Xinxiang 453002 Photobiology Group Photodynamics Research Center Inst. of Phys. and Chemical Research 19-1399 Koeji Nagamachi Aoba-ku Sendai 980 Japan

Abstract: Ten new 1, 4-disubstituted azo ureas were synthesized by the reaction of substituted semicarbazide compounds with a phenoxyl radical between two phases in good yield.

关键词： AZO UREAS SYNTHESIS OF disubstituted NEW

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A NOVEL METHOD FOR SYNTHESIZING α,α-disubstituted α-AMINO ACID——DIALKYLATION OF 2-OXAZOLIN-5-ONE

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Chinese Chemical Letters 1991年第3期2卷 193-194页

作者： Ji Jun CHEN Zheng Ming DU Yao Zeng SHI Hong Wen HU Dcpratment of Chemistry,Nanjing University,Nanjing 210008

4,4-Dialkyl-2-oxazolin-5-ones are prepared by one step reaction of 2-oxazolin-5-one with the magnesium methyl carbonate(MMC)and *** is a novel and convenient method for synthesis of α, Υ-disubstitutcd α-amino acid ... 详细信息

关键词： AMINO ACID A NOVEL METHOD FOR SYNTHESIZING DIALKYLATION OF 2-OXAZOLIN-5-ONE disubstituted ppm NH

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