Fluorocarbon and Hydrocarbon N‐Heterocyclic (C5–C7) Imidazole‐Based Liquid Crystals |
| |
| Authors: | Hongren Chen Fengying Hong Dr Guang Shao Dr Deyu Hang Lei Zhao Prof Zhuo Zeng |
| |
| Institution: | 1. College of Chemistry and Environment, South China Normal University, Guangzhou, 510006 (China), Fax: (+0086)?2039310287;2. School of Chemistry and Chemical Engineering, Sun Yat‐sen University, Guangzhou, 510275 (China);3. Beijing Bayi Space LCD Materials Technology Co., Ltd. Beijing 102205 (China);4. Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032 (China) |
| |
| Abstract: | 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. |
| |
| Keywords: | fluorine heterocycles ionic liquids mesophases phase transitions |
|
|
