摘要
通过硫氰酸盐亲核取代反应合成了以苯甲酸联苯酯为液晶基元的硫氰棒状分子,一端尾链中的碳原子数为6、8和10。用偏光显微镜和差示扫描量热分析法对所合成的化合物进行了液晶相的表征,结果表明,这些硫氰化合物均表现出热致性近晶A相、向列相及尚未定性的液晶相M。随着尾链的增长,向列相温度区间变窄,清亮点降低。
Rod-shaped thiocyanic compounds based on a 4-benzoyloxy-biphenyl mesogen were prepared by nucleophilic substitution with a thiocyanic salt.The number of carbon atoms in one terminal alkyloxy chain was 6,8 and 10.The mesomorphic properties of the synthesized compounds were characterized by means of polarized optical microscopy and differential scanning calorimeter.The results demonstrated that the thiocyanic compounds exhibited thermotropic smectic A and nematic phases.The isotropic point of the liquid crystals decreased with the increase in length of the terminal alkyloxy chain.
出处
《液晶与显示》
CAS
CSCD
北大核心
2011年第3期281-284,共4页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金资助项目(No.20974068)
教育部留学回国人员科研启动基金资助项目(No.20091341-11-9)
关键词
硫氰化合物
棒状分子
近晶A相
向列相
thiocyanic compound
rod-shaped molecule
smectic A
nematic
