Abstract

Twelve compounds containing a sulphur- or oxygen-based heterocyclic core, 1,3- oxazole or 1,3-thiazole ring with hydroxy, methoxy and methyl terminal substituent, were synthesized and characterized. The molecular structures of these compounds were performed by elemental analysis and different spectroscopic tequniques. The liquid crystalline behaviors were studied by using hot-stage optical polarizing microscopy and differential scanning calorimetry. All compounds of 1,4- disubstituted benzene core with oxazole ring display liquid crystalline smectic A (SmA) mesophase. The compounds of 1,3- and 1,4-disubstituted benzene core with thiazole ring exhibit exclusively enantiotropic nematic liquid crystal phases.

摘要

合成并表征了十二种含硫或氧基杂环核，带有羟基，甲氧基和甲基末端取代基的1，3-恶唑或1，3-噻唑环的化合物。这些化合物的分子结构通过元素分析和不同的光谱学方法进行。使用热台光学偏振显微镜和差示扫描量热法研究了液晶行为。1,4-二取代苯核与恶唑环的所有化合物均显示液晶近晶A（SmA）中间相。具有噻唑环的1，3-和1，4-二取代苯核的化合物仅表现出对映向列型液晶相。