Dicationic imidazolium-based ionic liquids and ionic liquid crystals with variously positioned fluoro substituents
作者:Xiaoju Li、Duncan W. Bruce、Jean'ne M. Shreeve
DOI:10.1039/b912873e
日期:——
A series of new dicationic imidazolium-based organic salts bearing fluoro substituents on the bent-core unit and/or linker benzene-ring positions has been synthesized and characterized. The properties of these salts, including transition and decomposition temperatures, and density were determined, indicating that their performance is strongly dependent on the positions of the fluoro substituents, the number of carbon atoms in the alkyl group, and the anion present. Examination by polarized optical microscopy showed that the four salts (compounds 4c, 7a, 7b and 8b, where the alkyl group was C12H25–) were mesomorphic and these data were supported by DSC measurements.
合成并表征了一系列新的二阳离子咪唑盐,这些盐在弯曲核心单元和/或连接苯环位置上具有氟取代基。这些盐的性质,包括相变温度、分解温度和密度得到了测定,表明它们的性能强烈依赖于氟取代基的位置、烷基链中碳原子的数量以及所含的阴离子。通过偏光显微镜的观察显示,四种盐(化合物4c、7a、7b和8b,其中烷基链为C12H25–)具有介晶性,这些数据得到了差示扫描量热法(DSC)测量的支持。