Enhanced anion exchange for selective sulfate extraction: Overcoming the Hofmeister bias

Christopher J. Fowler, Tamara J. Haverlock, Bruce A. Moyer, James A. Shriver, Dustin E. Gross, Manuel Marquez, Jonathan L. Sessler, Md Alamgir Hossain, Kristin Bowman-James

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)14386-14387
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number44
DOIs
StatePublished - Nov 5 2008

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