含氟吡咯、吡咯烷液晶分子的合成与性能研究  

Synthesis and Mesomorphic Studies on Liquid Crystals with Fluorinated Pyrrole,and Pyrrolidine

作　　者：李惠娟[1] 刘培炼[1] 陈虹任[1] 张弘[1] 曾卓[1] 

机构地区：[1]华南师范大学化学与环境学院,广州510006

出　　处：《华南师范大学学报（自然科学版）》2014年第3期75-81,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：广东省科技计划项目(2010A020507001-76);国家自然科学基金项目(21272080)

摘　　要：采用含氟砌块3-氟-4-吡咯烷苯酚、3-氟-4-(3,3,4,4-四氟)吡咯烷苯酚和3-氟-4-(3,4-二氟)吡咯苯酚合成了3个系列含氟氮杂环液晶新分子.用差示扫描量热法(DSC)和偏光显微镜(POM)对其介晶性研究,结果表明,相对末端为吡咯烷(n/m-4H)或3,3,4,4-四氟吡咯烷(n/m-4F)的分子,末端为3,4-二氟吡咯的分子(n/m-2F)更有利于液晶相的形成和稳定,它们具有宽的液晶相范围,且为向列相.当分子同时含双环己基液晶砌块和3,4-二氟吡咯端基时,就能获得宽的介晶相范围和高清亮点的向列相液晶.通过选择不同的含氮杂环、引入含氟取代基团和调节液晶结构单元,有效地改善了这些液晶分子的物理和化学性质.Three series of new fluorinated N-heterocycles liquid crystals were synthesized from the fluorinated block3-fluoro-4-（ pyrrolidin-1-yl） phenol（ 3-4H）,3-fluoro-4-（ 3,3,4,4- tetrafluoropyrrolidin-1-yl） phenol（ 3-4F） and4-（ 3,4-difluoro-1H-pyrrol-1-yl）-3-fluorophenol（ 3-2F）. Their mesogenic behavior was investigated with differential scanning calorimetry（ DSC） and polarized optical microscopy（ POM）. The results showed that the 3,4-difluoropyrrole derivatives are more conductive to the formation and stability of a liquid crystal phase than the pyrrolidine or3,3,4,4-tetrafluoropyrrolidine derivatives. The results of DSC,POM also show that 3,4-difluoropyrrole derivatives exihibit high clearing point and a broad temperature range of nematic phases. Compounds have a wide nematic phase and a high clearing point when we combine 3,4-difluoropyrrole as the terminal group and dicyclohexyl liquid crystal building block. The physical and chemical properties of the liquid crystal molecules can be adjusted by varying the type of N-heterocycles,introducing fluorine atoms and changing the length of terminal alkyl chain.

关 键 词：含氟液晶 吡咯衍生物 合成 介晶性能 

分 类 号：O753.2[理学—晶体学]