Recognition and Extraction of Cesium Hydroxide and Carbonate using a Neutral Multitopic Ion-Pair Receptor.

Author(s) He, Q.; Peters, G.Marie; Lynch, V.M.; Sessler, J.L.
Journal Angew Chem Int Ed Engl
Date Published 2017 Jul 20

Current approaches to lowering the pH of basic media rely on the addition of a proton source. An alternative approach is described here 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 1H NMR 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.

DOI 10.1002/anie.201705788
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2017.

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