摘要
以4-烷基反式环己基甲酸为原料,经格氏、黄鸣龙、碘代及“一锅法”Sonogashira偶联等反应,制备了10个含乙撑桥键二苯炔四环液晶化合物,其结构经IR,NMR和MS确认.利用差示扫描量热仪(DSC)、偏光显微镜(POM)和阿贝折光仪对目标化合物进行了性能测试.结果表明,目标化合物具有高清亮点(220—240℃)、宽向列相区间(59.6~99.6℃)和大光学各向异性(△n〉0.3),其性能可满足液晶光学的应用要求.
Ten four-ring liquid crystals with ethylene and internal alkyne bridge were synthesized via Grignard reaction, Huang Minglong reduction, iodination, "one-pot" Sonogashira cross-coupling reaction with trans-4- alkyl-cyclohexane-carboxylic-acid as the starting substrate. The structures of the compounds were confirmed by infrared spectrometry( IR), nuclear magnetic resonance(NMR) and mass spectra(MS). The differential scanning calorimetry(DSC) , polarising optical microscopy (POM) and Abbe refractometer were used to measure their properties. The results show that the compounds possess high clearing point (220--240 ℃), broad nematic phase (59.6-99.6 ℃ ) and high birefringence (△n〉0.3). These properties match the requirement of liquid crystal optics.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第7期1433-1438,共6页
Chemical Journal of Chinese Universities
基金
陕西省自然科学基金(批准号:2012JM2002)
陕西省科技攻关项目(批准号:2012K08-09)
中央高校团队项目(批准号:GK261001108,GK261001009)
中央高校基本科研业务费专项资金(批准号:GK201101003,GK201302036,GK201302037)资助~~
关键词
高清亮点
炔桥键
双折射率
太赫兹
High clearing point
Alkyne-bridge
Birefringence
Terahertz