液晶性芳香醌化合物的合成  

Synthesis of Liquid Crystalline Aromatic Quinone Compounds

作　　者：张淑媛[1] 杨海隆[1] 朱路[1] 

机构地区：[1]郑州大学化学系,郑州450001

出　　处：《郑州大学学报（理学版）》2007年第1期92-95,共4页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目;编号29974026;河南省自然科学基金;河南省教育厅自然科学基金资助项目

摘　　要：以1-溴代正烷烃、4-羟基-4′联苯基羧酸和氢醌为原料通过醚化、氧化和酯化反应,合成了一系列新的液晶性2,5-双[4′-(对烷氧基苯基)苯甲酰氧基]对苯二醌(化合物3).化合物3的结构通过元素分析、红外光谱和核磁共振波谱等方法确证,其液晶行为用示差扫描量热法(DSC)和偏光显微镜(POM)表征.发现化合物3加热至各自的熔点以上都能形成液晶态.在液晶态可以观察到近晶相和向列相的典型织构.随分子中末端烷氧基碳原子数增加,化合物3的熔点(Tm)和液晶态的清亮点(Ti)呈规律性变化,近晶相范围和近晶相-向列相转变温度渐增,而向列相范围递减.A series of novel liquid crystalline 2,5-bis[4- （p-alkoxylphenyl） benzoyloxy] p- benzoquinone are synthesized via etherification,oxygenation and esterization reactions by using 1-bromonalkane,4-hydroxy-4＇-biphenylcarboxylic acid,and hydro-quinone as raw materials. The structures of compound 3 are identified by using elemental analysis,IR and ^1H-NMR. The liquid crystalline behavior of compound 3 is characterized by differential scanning calorimetry（DSC） and polarizing optical microscopy（POM）. It is found that compound 3 goes into liquid crystal phase when heated to their melting point （Tm）. The typical smectic phase and nematic phase texture can be observed. Both Tm and isotropization temperature （Ti） of compound 3 change regularly with the carbon numbers of the end alkoxy groups. There is a gradual increase in smectic phase length and so do the smectic-nematic transition temperature. At the same time there is a gradual decrease in nematic phase length.

关 键 词：2 5-双[4’-(对烷氧基苯基)苯甲酰氧基]对苯二醌 热致性液晶 合成 

分 类 号：O625.41[理学—有机化学]