物理化学学报Issue(4)：653-659,7.DOI:10.3866/PKU.WHXB201502031
分子间作用力对咪唑盐介晶相性质的影响
Influence of Intermolecular Interactions on the Mesogenic Properties of Imidazolium Salts
摘要
Abstract
A series of imidazolium salt-based ionic liquid crystals with a smectic A (SmA) phase are synthesized by altering the substituents attached to the 1-position (N1) and 3-position (N3) of the imidazolium ring, and anions. The mesogenic properties of the imidazolium salts, including mesophase temperature range and structural properties, are studied by differential scanning calorimetry, smal-angle X-ray diffraction, and single crystal diffraction. The anisotropic ion conductivities of several ionic liquid crystals are also measured. It is found that substituents attached to N1 or N3 and the anions influence the van der Waals interactions and hydrogen bond, which results in a significant effect on the mesogenic properties of the imidazolium salts. Moreover, when a vinyl group is attached to the N3 position,π-πstacking interactions form between adjacent layers. This not only benefits the formation of a mesophase but also results in the biggest layer spacing and lowest anisotropic ion conductivities for imidazolium tetrafluoroborates. These results suggest that al intermolecular interactions should be taken into account when regulating the mesogenic properties of ionic liquid crystals.关键词
咪唑盐/介晶相性质/范德华作用/氢键/π-π堆积Key words
Imidazolium salts/Mesogenic property/van der Waals interaction/Hydrogen bond/π-πstacking分类
化学化工引用本文复制引用
王猛,潘旭,戴松元,陈健..分子间作用力对咪唑盐介晶相性质的影响[J].物理化学学报,2015,(4):653-659,7.基金项目
The project was supported by the National Key Basic Research Program of China (973)(2011CBA00700), National High Technology Research and Development Program of China (863)(2011AA050510), National Natural Science Foundation of China (21103197,21273242), National Science Foundation for Post-doctoral Scientists of China (2013M540526).国家重点基础研究发展规划项目(973)(2011CBA00700),国家高技术研究发展计划项目(863)(2011AA050510),国家自然科学基金(21103197,21273242)及中国博士后科学基金(2013M540526)资助 （973）
