【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1 HNMR、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420mP·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。更多还原

【Abstract】 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 1 H 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 ℃ and202℃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.更多还原