Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail  

作　　者：Xiao Dong Li Mao Sheng Zhan Kai Wang 

机构地区：[1]School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

出　　处：《Chinese Chemical Letters》2011年第9期1111-1114,共4页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.51073007)

摘　　要：Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N（1,7）-n-OPIMB and N（1,7）-n-SP1MB （n = 20, 22）, respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry （DSC）, polarizing optical microscopy （POM） and X-ray diffraction （XRD）. Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N（1,7）-n-OPIMB, N（1,7）-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1,7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence.Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N（1,7）-n-OPIMB and N（1,7）-n-SP1MB （n = 20, 22）, respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry （DSC）, polarizing optical microscopy （POM） and X-ray diffraction （XRD）. Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N（1,7）-n-OPIMB, N（1,7）-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1,7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence.

关 键 词：Bent-shaped Liquid crystal Alkylthio tail Mesomorphic behaviour 

分 类 号：TQ462.26[化学工程—制药化工] TG665[金属学及工艺—金属切削加工及机床]