Enhanced Anion Exchange for Selective Sulfate Extraction: Overcoming the Hofmeister Bias

详细信息    查看全文

• 作者：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
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：November 5, 2008
• 年：2008
• 卷：130
• 期：44
• 页码：14386-14387
• 全文大小：116K
• 年卷期：v.130,no.44(November 5, 2008)
• ISSN：1520-5126

文摘

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.