Back to Search Start Over

Enhanced liquid–liquid anion exchange using macrocyclic anion receptors: effect of receptor structure on sulphate–nitrate exchange selectivity

Authors :
James A. Shriver
Tamara J. Haverlock
Dustin E. Gross
Manuel Marquez
Lætitia H. Delmau
Jonathan L. Sessler
Bruce A. Moyer
Hyun-Ah Kang
Vincent M. Lynch
Christopher J. Fowler
Kristin Bowman-James
Frederick V. Sloop
Nathan L. Bill
Diadra M. Bau
Alamgir Hossain
Source :
Supramolecular Chemistry. 22:653-671
Publication Year :
2010
Publisher :
Informa UK Limited, 2010.

Abstract

When certain macrocyclic anion receptors are added to a chloroform solution of the nitrate form of a lipophilic quaternary ammonium salt (methyltri-C8,10-ammonium nitrate, Aliquat 336N), the extraction of sulphate from an aqueous sodium nitrate solution via exchange with the organic-phase nitrate is significantly enhanced. Eight macrocycles were surveyed, including two derivatives of a tetraamide macrocycle, five derivatives of calix[4]pyrrole and β-decafluorocalix[5]pyrrole. Under the hypothesis that the enhancement originates from sulphate binding by the anion receptors in the chloroform phase, it was possible to obtain reasonable fits to the sulphate distribution survey data based on the formation of 1:1 and 2:1 receptor:sulphate complexes in the chloroform phase. Apparent 1:1 sulphate-binding constants obtained from the model in this system fell in the range . Comparison of the results for the various anion receptors included in this study reveals that sulphate binding is sensitive to the nature of th...

Details

ISSN :
10290478 and 10610278
Volume :
22
Database :
OpenAIRE
Journal :
Supramolecular Chemistry
Accession number :
edsair.doi...........14b4ad26720e3f23ddefcb8cd5c90c18
Full Text :
https://doi.org/10.1080/10610271003763263