离子液体
化学
烷基
萃取(化学)
无机化学
水溶液
三元运算
离子
磺酰
离子交换
联苯
离子键合
有机化学
催化作用
计算机科学
程序设计语言
作者
Mark L. Dietz,Dominique C. Stepinski
出处
期刊:Green Chemistry
[The Royal Society of Chemistry]
日期:2005-01-01
卷期号:7 (10): 747-747
被引量:169
摘要
Partitioning of sodium ions between aqueous nitrate media and 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imides (Cnmim+Tf2N−) in the presence of dicyclohexano-18-crown-6 is shown to take place via as many as three pathways: conventional nitrato complex extraction and/or either or both of two ion-exchange processes, the relative importance of which is determined by aqueous acidity and the hydrophobicity of the ionic liquid cation. Contrary to expectations, increasing the alkyl chain length of the IL cation (from C5mim+ to C10mim+) is insufficient to eliminate the possibility of ion exchange as a mode of metal ion partitioning between the two phases, an observation with negative implications for the utility of ILs as environmentally benign extraction solvents.
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