具有不同柱状结构的苯并菲盘状液晶化合物的合成及自组装

合成了3种含有不同长度烷基链的苯并菲盘状液晶化合物; 通过1H NMR 和 MALDI-TOF MS对其结构进行了表征; 利用差示扫描量热法(DSC)、热台偏光显微镜(POM)和小角X射线散射实验(SAXS)对3种液晶化合物的自组装行为进行了研究. 结果表明, 烷基链的长度对苯并菲盘状液晶化合物自组装结构的影响显著. 柔性链为辛基的苯并菲盘状液晶化合物自组装成六方柱状液晶相; 柔性链为十二烷基的化合物自组装成倾斜柱状液晶相; 而柔性链为十六烷基的化合物则未形成液晶相.

Various Columnar Nano-structures from Self-Assembly of Triphenylene Discotic Liquid Crystalline Molecules

Discotic liquid crystalline molecules, consisting of a flexible alkyl chain and a rigid block, have a strong ability to self-assemble into a variety of columnar nanostructures in the liquid crystalline phase.  In this paper, we report the synthesis and characterization of the self-assembly behavior of the three kinds of triphenylene discotic liquid crystalline molecules with various lengths of alkyl chains. Structural study of these moleculses by means of differential scanning calorimetry(DSC), polarizing optical microscopy(POM) and X-ray diffraction(XRD) revealed that the lengths of alkyl chains of triphenylene discotic liquid crystalline mo-lecules was strongly influenced the self assembly behavior in the liquid crystalline phase. The molecules containing octyl chains or dodecanyl chains self-assembled into 2D hexagonal columnar structure or 2D oblique columnar structure, respectively, in the liquid crystalline phase. While, the molecule containing hexadecyl chains did not construct ordered columnar nanostructure in the bulk state.