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Molecules 2009, 14(12), 5001-5016; doi:10.3390/molecules14125001
Article

18-Crown-6 and Dibenzo-18-crown-6 Assisted Extraction of Cesium from Water into Room Temperature Ionic Liquids and Its Correlation with Stability Constants for Cesium Complexes

1
, 2
, 2
, 2
, 1,3
, 4
 and 2,*
1 State Research Institute of Reagents and High Purity Substances (IREA), Bogorodskii val 3, 107258, Moscow, Russia 2 Department of Chemistry, M.V. Lomonosov Moscow State University, 1-3 Leninskiye gory, 119992, Moscow, Russia 3 Department of Physical and Colloid Chemistry, Moscow State University of Food Technologies, Volokolamskoye Sh. 11, 125080, Moscow, Russia 4 Zelinsky Institute of Organic Chemistry RAS, Leninsky pr. 47, 119991, Moscow, Russia
* Author to whom correspondence should be addressed.
Received: 1 September 2009 / Revised: 24 November 2009 / Accepted: 27 November 2009 / Published: 2 December 2009
(This article belongs to the Special Issue Ionic Liquids)
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Abstract

The pH-profiles of the extraction of Cs+ into four conventional (1-butyl-3-methylimidazolium hexafluorophosphate and bis[trifluoromethyl)sulphonyl]imides of 1-butyl-3-methylimidazolium, 1-hexyl-3-methylimidazolium, and 1-(2-ethylhexyl)-3- methylimidazolium) and two novel (trioctylmethylammonium salicylate and tetrahexylammonium dihexylsulfosuccinate) room temperature ionic liquids have been determined both in the absence and in the presence of crown ether (18-crown-6 or dibenzo-18-crown-6). The pH-profiles of distribution ratio of crown ethers have been established in the same conditions. The relationship of cesium extraction efficiency both with the stability of its complexes with crown ethers and crown ethers’ distribution ratio has been clarified.
Keywords: ionic liquids; crown ethers; cesium extraction; stability constants ionic liquids; crown ethers; cesium extraction; stability constants
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Vendilo, A.G.; Djigailo, D.I.; Smirnova, S.V.; Torocheshnikova, I.I.; Popov, K.I.; Krasovsky, V.G.; Pletnev, I.V. 18-Crown-6 and Dibenzo-18-crown-6 Assisted Extraction of Cesium from Water into Room Temperature Ionic Liquids and Its Correlation with Stability Constants for Cesium Complexes. Molecules 2009, 14, 5001-5016.

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