Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 44, Pages 14386-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja806511b
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Funding
- Environmental Management Science Program of the Offices of Science and Environmental Management
- U.S. DOE [DE-AC05-00OR22725]
- Oak Ridge National Laboratory [DE-FG-96ER62307, DE-FG-02-04ER63741]
- The Univ. of Kansas
- The Univ. of Texas
- NIH [GM 58907]
- INEST Group (PMUSA)
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In this communication, a new approach to enhancing the efficacy of liquid - liquid anion exchange is demonstrated. It involves the concurrent use of appropriately chosen hydrogen-bond-donating (HBD) anion receptors in combination with a traditional quaternary ammonium extractant. The fluorinated calixpyrroles 1 and 2 and the tetraamide macrocycle 4 were found to be particularly effective receptors. Specifically, their use allowed the extraction of sulfate by tricaprylmethylammonium nitrate to be effected in the presence of excess nitrate. As such, the present work provides a rare demonstration of overcoming the Hofmeister bias in a competitive environment and the first to the authors' knowledge wherein this difficult-to-achieve objective is attained using a neutral HBD-based anion binding agent under conditions of solvent extraction.
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