TY - JOUR
T1 - Enhanced anion exchange for selective sulfate extraction
T2 - Overcoming the Hofmeister bias
AU - Fowler, Christopher J.
AU - Haverlock, Tamara J.
AU - Moyer, Bruce A.
AU - Shriver, James A.
AU - Gross, Dustin E.
AU - Marquez, Manuel
AU - Sessler, Jonathan L.
AU - Hossain, Md Alamgir
AU - Bowman-James, Kristin
PY - 2008/11/5
Y1 - 2008/11/5
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=55549093793&partnerID=8YFLogxK
U2 - 10.1021/ja806511b
DO - 10.1021/ja806511b
M3 - Article
C2 - 18841965
AN - SCOPUS:55549093793
SN - 0002-7863
VL - 130
SP - 14386
EP - 14387
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 44
ER -