论文部分内容阅读
设计并合成了4个对称联苯双酯类液晶化合物,化合物结构通过红外和核磁表征,它们的介晶性通过差示扫描量热仪(DSC),X射线衍射仪(XRD)和热台偏光显微镜(POM)进行了研究.并测定了4,4′-3,3′,5,5′-四甲基联苯-二(4-巴基苯甲酸酯)(Ⅲa)的单晶结构,结果显示:晶体属于单斜晶系,P21/c空间群,晶胞参数为a=18.525(3),6=12.196(2),c=12.195(2)(?),β=97.142(2)°,V=2733.7(9)(?)3,Z=4,Dc=1.163 Mg/m3,R=0.0521,Rw=0.1161.化合物均为热致型互变液晶,并讨论了氧原子、不饱和端基和端基链长对介晶性的影响.
Four symmetrical bifendate liquid crystal compounds were designed and synthesized. The structures of the compounds were characterized by IR and NMR. Their mesogenicities were characterized by DSC, XRD, (POM), and the single crystal structure of 4,4’-3,3 ’, 5,5’-tetramethylbiphenyl-bis (4-picolinate) The results show that the crystal belongs to the monoclinic space group P21 / c with cell parameters of a = 18.525 (3), 6 = 12.196 (2), c = 12.195 (2) ) °, V = 2733.7 (9) (?) 3, Z = 4, Dc = 1.163 Mg / m3, R = 0.0521, Rw = 0.1161. The compounds are all thermotropic liquid crystals and discussed oxygen atoms, Effect of Saturated End Group and End Group Chain Length on Mesomorphism.