首页> 外文期刊>Chemistry: A European journal >Imidazolium Salt Ion Pairs in Solution
【24h】

Imidazolium Salt Ion Pairs in Solution

机译:溶液中的咪唑盐离子对

获取原文
获取原文并翻译 | 示例
           

摘要

The formation, stabilisation and reactivity of contact ion pairs of non-protic imidazolium ionic liquids (ILs) in solution are conceptualized in light of selected experimental evidence as well theoretical calculations reported mainly in the last ten years. Electric conductivity, NMR, ESI-MS and IR data as well as theoretical calculations support not only the formation of contact ion pairs in solution, but also the presence of larger ionic and neutral aggregates even when dissolved in solvents with relatively high dielectric constants, such as acetonitrile and DMSO. The presence of larger imidazolium supramolecular aggregates is favoured at higher salt concentrations in solvents of low dielectric constant for ILs that contain shorter N-alkyl side chains associated with anions of low coordination ability. The stability and reactivity of neutral contact species are also dependent on the nature of the anion, imidazolium substituents, and are more abundant in ILs containing strong coordinating anions, in particular those that can form charge transfer complexes with the imidazolium cation. Finally, some ILs display reactivities as contact ion pairs rather than solvent-separated ions.
机译:非质子咪唑离子液体(ILs)在溶液中的接触离子对的形成,稳定和反应性是根据选定的实验证据以及最近十年主要报道的理论计算概念化的。电导率,NMR,ESI-MS和IR数据以及理论计算不仅支持溶液中接触离子对的形成,而且即使溶解在介电常数相对较高的溶剂中,也支持较大的离子和中性聚集体的存在,例如作为乙腈和DMSO。对于介电常数低的溶剂,如果盐浓度较高,则存在较大的咪唑鎓超分子聚集体是有利的,因为IL包含较短的N-烷基侧链和低配位能力的阴离子。中性接触物种的稳定性和反应性还取决于阴离子,咪唑鎓取代基的性质,并且在含有强配位阴离子的IL中含量尤其丰富,尤其是那些可以与咪唑鎓阳离子形成电荷转移络合物的离子。最后,某些离子液体以接触离子对的形式显示反应性,而不是溶剂分离的离子。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号