Self-Assembly of Imidazolium-Based Rodlike Ionic Liquid Crystals: Transition from Lamellar to Micellar Organization
作者:Xiaohong Cheng、Xueqing Bai、Shan Jing、Helgard Ebert、Marko Prehm、Carsten Tschierske
DOI:10.1002/chem.200903210
日期:2010.4.19
By using aryl‐amination chemistry, a series of rodlike 1‐phenyl‐1H‐imidazole‐based liquid crystals (LCs) and related imidazolium‐based ionic liquid crystals (ILCs) has been prepared. The number and length of the C‐terminal chains (at the noncharged end of the rodlike core) and the length of the N‐terminal chain (on the imidazolium unit in the ILCs) were modified and the influence of these structural
通过使用芳基胺化化学方法,制备了一系列棒状的1-苯基-1 H-咪唑基液晶(LC)和相关的咪唑基离子液晶(ILC)。修改了C端链的数量和长度(在棒状核的不带电荷的末端)和N端链的长度(在ILC中的咪唑单元上),并且这些结构参数对模式的影响通过偏光显微镜,差示扫描量热法和X射线衍射研究了LC相中自组装的机理。对于单链咪唑衍生物,向列相(N)和双层SmA 2虽然发现了液相,但随着烷基链数量的增加,液相色谱丢失了。对于相关的咪唑鎓盐,LC相会随着C末端链的数量和长度的增加而得以保留,并且在该系列中,它导致了SmA–柱状(Col)–胶束立方(Cub I / Pm 3 n)的相序。N端链的延伸给出了相反的序列。短的N端链更倾向于将端粒的端到端堆积,其中这些链与C端链是分开的。N末端链的延长导致N末端链和C末端链的混合,并伴有芳族核的完全插入。在近晶阶段,这会导致从双层(SmA 2)到单层近晶(SmA)