文献类型： 外文期刊
作者： Sun, Yi-Xin 1 ; Wang, Ying-Ying 1 ; Shen, Bing-Bing 1 ; Zhang, Bi-Xian 2 ; Hu, Xiao-Mei 1 ;
作者机构： 1.Northeast Agr Univ, Coll Life Sci, Harbin 150030, Heilongjiang, Peoples R China
2.Heilongjiang Acad Agr Sci, Harbin 150086, Heilongjiang, Peoples R China
关键词： dicationic ionic liquids; homogeneous; heterogeneous; miscibility
期刊名称：ROYAL SOCIETY OPEN SCIENCE （ 影响因子：2.963； 五年影响因子：3.44 ）
ISSN： 2054-5703
年卷期： 2018 年 5 卷 12 期
页码：
收录情况： SCI
摘要： A series of dicationic ionic liquids (ILs) including [C-4(MIM)(2)][PF6](2), [C-5(MIM)(2)][PF6](2), [C-6(MIK2][PF6](2) and [C-4(PYR)(2)][PF6](2) were synthesized. Their thermal stability and melting points were analysed. It was found that dicationic ILs pr sented important implications in the design of homogeneous and heterogeneous system with water. A homogeneous system of dicationic ILs with water could be formed at a relatively high temperature and then a heterogeneous system was formed when the solution was cooled to a low temperature. The ILs recovered by altering the temperature were obtained in high percentage yields of [C-4(MIM)(2)][PF6](2) (97.6%), [C-5(MIM)(2)][PF6](2) (97.3%), [C-6(MIM)(2)][PF6](2) (98.0%) and [C-4(PYR)(2)][PF6](2) (94.2%). On the other hand, [C-4(MIM)(2)][PF6](2) and [C-5(MLM)(2)][PF6](2) exhibited good solubility in acetonitrile and acetone. A homogeneous system could be achieved with inlidazolium-based ILs with a relatively low amount of water and acetonitrile at room temperature. All of the properties of dicationic ILs have a strong correlation with the nature of dications, the linkage chain and the symmetry of dications. Dicationic ILs may provide a new opportunity for some specific applications in order to enable the effective separation and isolation of products.
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