Chen Hongren, Hong Fengying, Shao Guang, Hang Deyu, Zhao Lei, Zeng Zhuo
College of Chemistry and Environment, South China Normal University, Guangzhou, 510006 (China), Fax: (+0086) 2039310287.
Chem Asian J. 2014 Dec;9(12):3418-30. doi: 10.1002/asia.201402576. Epub 2014 Sep 26.
By using three synthetic protocols, a series of fluorocarbon and hydrocarbon N-heterocyclic imidazole-based liquid crystals (LCs) and related imidazolium-based ionic liquid crystals (ILCs) have been prepared. The ring size of the N-heterocycle and the length of the N-terminal chain (on the imidazolium unit in the ILCs) were modified, and the influence of these structural parameters on liquid-crystal phases was investigated by means of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). These new ILCs exhibit a disordered smectic phase (SmA), good thermal stabilities, a broad smectic phase range, a high dipole moment, relatively low melting points, but high clearing points and strong emission fluorescence relative to imidazole-based LCs. These encouraging results have led us to believe these fluorocarbon and hydrocarbon N-heterocyclic imidazole-based LCs and related imidazolium-based ILCs could be used as new liquid-crystalline materials.
通过使用三种合成方案，制备了一系列基于氟碳和碳氢化合物的N-杂环咪唑基液晶（LCs）以及相关的咪唑基离子液晶（ILCs）。对N-杂环的环尺寸和N端链的长度（在ILCs的咪唑鎓单元上）进行了修饰，并通过偏光显微镜（POM）、差示扫描量热法（DSC）和X射线衍射（XRD）研究了这些结构参数对液晶相的影响。这些新型ILCs呈现无序近晶相（SmA）、良好的热稳定性、较宽的近晶相范围、高偶极矩、相对较低的熔点，但具有较高的清亮点以及相对于基于咪唑基液晶而言较强的发射荧光。这些令人鼓舞的结果使我们相信，这些基于氟碳和碳氢化合物的N-杂环咪唑基液晶以及相关的咪唑基离子液晶可作为新型液晶材料使用。
