摘要
以对烷基溴苯和4-溴-2,3-二氟苯酚为原料,经芳基硼酸化、Suzuki偶联反应、Sonogashira偶联反应和碘代等反应,制得16种侧向多氟取代二芳基乙炔类液晶化合物,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)和阿贝折光仪对该系列化合物进行了性能研究。结果表明,该系列化合物具有较低的熔点、宽的液晶相区以及较高的光学各向异性值(Δn>0.3)。该类液晶具有在双频液晶中应用的广阔前景。
Abstract Sixteen lateral multi-fluorine substituted internal alkynes liquid crystals were synthesized via a series of reactions including substituted phenylboronic acidation, Suzuki cross-coupling, Sonogashira cross- coupling and iodination using 4-bromo-alkytbenzene and 4-bromo-2,3-difluoro-phenol precursors. The structures of the products were characterized by means of IR, NMR and MS. The differential scanning calorimetric, polarizing microscope and Abbe refractometer, were used to investigate their properties. The results demonstrate that the compounds possess low melting point, wide phase transition interval and high optical anisotropy value （△n 〉 0.3 ）. The obtained liquid crystals might find broad potential applications in dual-frequency liquid crystals.
出处
《应用化学》
CAS
CSCD
北大核心
2013年第8期861-866,共6页
Chinese Journal of Applied Chemistry
关键词
侧向多氟取代
二芳基乙炔
双频液晶
lateral multi-fluorine substitution
internal alkynes
dual-frequency liquid crystals
