含偶氮苯基团咪唑离子液晶的合成及其光响应性

Synthesis of Imidazole Ionic Liquid Crystal Containing Azobenzyl Group and Its Photoresponsiveness

设计合成一种新型含偶氮苯基团的咪唑离子液晶化合物,并用核磁共振氢谱、质谱和红外光谱表征其结构,通过热重和差示扫描量热仪对其热性质进行表征.结果表明:该化合物在190℃前稳定存在,熔点为142.96℃,降温时在124.37~134.04℃出现液晶区间;用偏光显微镜可观察到化合物的球形织构,通过X射线衍射测试确认其为层状结构;在紫外光照射时,化合物从反式到顺式异构化的光响应时间为205 s,在日光灯照射时,化合物从顺式到反式异构化的光响应时间为595 s,反-顺异构化程度达80.4%.

We designed and synthesized a novel imidazole ionic liquid crystal compound containing azobenzene group,its structure was characterized by 1 H nuclear magnetic resonance,mass spectrum and infrared spectrum,and its thermal properties were characterized by thermogravimetry and differential scanning calorimetry.The results show that compound remains stable before 190℃,the melting point is 142.96℃,and the liquid crystal range is 124.37—134.04℃upon cooling.The spherical texture of compound can be observed by using polarization microscope,and confirmed to be the layered structure of compound by X-ray diffraction test.The photo-responsive time of compound from trans to cis isomerization is 205 s when it is irradiated by ultraviolet light,the photo-responsive time of compound from cis to trans isomerization is 595 s when it is irradiated by visible light,and the degree of trans-cis isomerization reaches 80.4%.