一类新的液晶性芳香羧酸化合物的合成  

Synthesis of a New Kind of Liquid Crystalline Aromatic Carboxylic Acid Compounds

作　　者：唐斯甫[1] 王志玲[1] 徐晓辉[2] 李自法[2] 朱卫国[1] 侯红卫[1] 张淑媛[1] 

机构地区：[1]郑州大学化学系,郑州450052 [2]郑州大学材料工程学院,郑州450052

出　　处：《郑州大学学报（理学版）》2003年第4期77-79,91,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 2 99740 2 6;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：合成了一系列新的液晶性芳香羧酸化合物 .化合物的结构通过元素分析、红外光谱、核磁共振波谱和质谱等方法确证 .化合物 5的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 5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向列相的丝状织构和纹影织构 .随分子中末端烷氧基碳原子数增加 ,化合物 5的熔点 (Tm)和液晶态的清亮点 (Ti)呈规律性变化 ,液晶态温度范围变宽 .A series of novel liquid crystalline aromatic carboxylic acid compounds are synthesized. The compounds are identified by using elemental analysis,infrared spectrum,nuclear magnetion reasonance and mass spectrometry. The liquid-crystalline behavior of the compound 5 is characterized by differential scanning calorimetery(DSC) and polarizing optical microscopy(POM). It is found that the compound 5 go into liquid crystal phase when heated to their T _m. The threaded texture and Schlieren texture of nematic phase can be observed. Both melting point( T _m) and isotropization temperature( T _i) of compound 5 change regularly with the carbon numbers of the end alkoxy groups increasing,accordingly,the temperature range of the liquid crystal phase of the compound 5 becomes wide.

关 键 词：芳香羧酸化合物 合成 热致性液晶 液晶态 熔点 化学结构 

分 类 号：O625.51[理学—有机化学]