摘要
含稠杂环液晶是当前液晶分子结构设计与开发的重要方向。本文采用环己基取代的乙炔与邻碘代苯酚衍生物经过钯催化偶联-关环反应合成出新型具有5,6-二氟取代苯并呋喃环结构的液晶化合物,总收率达到54%。采用1HNMR、MS对其结构进行了表征,采用DSC和POM对其热性能进行了测试,发现该化合物熔点为118℃,清亮点为202℃,向列相液晶温区84℃。物理性能测试表明,该类液晶化合物的双折射率约为0.13,介电各向异性达到12.6,旋转粘度为420 mP·s。与类似的3,4-二氟苯类液晶化合物相比,含5,6-二氟取代苯并呋喃环的液晶分子双折射率增大65%,介电常数值增大97%,清亮点增加63%。5,6-二氟取代苯并呋喃作为一种新的含氟砌块,综合性能表现突出,在液晶显示领域有良好的应用前景。
At present,liquid crystal with fused heterocyclic ring is an important direction of molecular structure design and development.In this paper,a new liquid crystal compound with 5,6-difluorobenzofuran ring structure was synthesized via palladium catalyzed coupling reaction and ring closing reaction of cyclohexyl substituted acetylene and o-iodophenol derivative.The total yield was 54%.Its structure was characterized by 1H NMR and MS,and its phase transition temperatures were tested by DSC and POM.It is found that the melting point and the clear point of the compound is 118℃and 202℃respectively,and the nematic temperature range is 84℃.The physical properties test shows that the birefringence is about 0.13,the dielectric anisotropy is 12.6 and the rotational viscosity is 420 mPa·s.Compared with the similar 3,4-difluorobenzene liquid crystal compound,the birefringence of the compound containing 5,6-difluorobenzofuran ring increases by 65%,the dielectric constant increases by 97%,and the clear point increases by 66%.As a new kind of fluorine-containing building block,5,6-difluorobenzofuran has outstanding comprehensive performance and good application prospect in the field of liquid crystal display.
作者
李建
车昭毅
莫玲超
胡明刚
邓登
杜渭松
高嫒嫒
LI Jian;CHE Zhao-yi;MO Ling-chao;HU Ming-gang;DENG Deng;DU Wei-song;GAO Ai-ai(State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an 710065, China;Xi’an Modern Chemistry Research Institute, Xi’an 710065, China;Xi’an Caijing Opo-eletric Science and Technology Co., Ltd., Xi’an 710065, China)
出处
《液晶与显示》
CAS
CSCD
北大核心
2020年第10期1000-1005,共6页
Chinese Journal of Liquid Crystals and Displays
基金
陕西省重点研发计划(No.2019ZDLGY04-06)。
关键词
含氟液晶
苯并呋喃
合成
双折射率
介电各向异性
fluorinated liquid crystal
benzofuran
synthesis
birefringence
dielectric anisotropy
作者简介
通信联系人:李建(1975-),男,陕西汉中人,硕士,研究员,2002年于西安近代化学研究所获得硕士学位,主要从事液晶材料分子设计与合成、性能及器件应用研究,E-mail:204lijian@163.com。
