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

Autor: 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
Rok vydání: 2010
Předmět:
Zdroj: Supramolecular Chemistry. 22:653-671
ISSN: 1029-0478
1061-0278
Popis: 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...
Databáze: OpenAIRE
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