Recognition and Extraction of Cesium Hydroxide and Carbonate by Using a Neutral Multitopic Ion-Pair Receptor
Recognition and Extraction of Cesium Hydroxide and Carbonate by Using a Neutral Multitopic Ion-Pair Receptor
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DOI：
10.1002/anie.201705788
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发表时间：
2017-10-16
影响因子：
16.6
通讯作者：
Sessler, Jonathan L.
中科院分区：
文献类型：
--
作者：
He, Qing;Peters, Gretchen Marie;Sessler, Jonathan L.
目前降低碱性介质pH值的方法依赖于添加质子源。本文描述了一种替代方法，其涉及从高碱性介质中基于液-液萃取除去铯盐，特别是CsOH和Cs2 CO 3。使用多主题离子对受体（2），其可以识别和提取氢氧化物和碳酸根阴离子作为其铯盐，如通过（HNMR）-H-1光谱滴定、ICP-MS、单晶结构分析和理论计算所证实的。在接收相的pH值和铯浓度的急剧增加时，观察到受体2作为载体在U型管实验涉及CsOH的运输通过一个居间氯仿层。源相的pH同样降低。
Current approaches to lowering the pH of basic media rely on the addition of a proton source. An alternative approach is described herein that involves the liquid-liquid extraction-based removal of cesium salts, specifically CsOH and Cs2CO3, from highly basic media. A multitopic ion-pair receptor (2) is used that can recognize and extract the hydroxide and carbonate anions as their cesium salts, as confirmed by (HNMR)-H-1 spectroscopic titrations, ICP-MS, single-crystal structural analyses, and theoretical calculations. A sharp increase in the pH and cesium concentrations in the receiving phase is observed when receptor 2 is employed as a carrier in U-tube experiments involving the transport of CsOH through an intervening chloroform layer. The pH of the source phase likewise decreases.