含氟三苯二炔类液晶化合物合成及其性质研究

摘要

More and more application requires faster response speed for nematic liquid crystal materials at present.There is a direct relationship between response speed and birefringence.The fluorinated phenylethynyltolane compounds (Ⅳ )with high birefringence,low melting point were synthesized. Their structures were determined by IR,1 H NMR,1 3 C NMR.The liquid crystalline properties were tested by DSC and POM.It shows that these compounds synthesized exhibit low melting point and broad temperature range of nematic phase(with the range about 100℃).These compounds exhibit high birefringence(Δn >0.47)after being tested birefringence.These characters are particularly at-tractive for increasing response speed of liquid crystal materials and improve the optical properties of liquid crystal.%目前,越来越多的液晶应用要求向列相液晶材料具有高双折射率性能。本文合成了5个高双折射率含氟三苯二炔类液晶化合物(Ⅳ),经过 IR,1 H NMR,13 C NMR 谱图鉴定,这些化合物的分子结构完全正确；通过 DSC 和 POM 对其液晶相态测试的实验结果表明该类液晶化合物具有较低的熔点和相对较宽的向列相温度范围(达到100℃左右)；对其折光率测试结果表明这些液晶化合物的双折射率(Δn)值在0．47以上,改善液晶光学性能。