Abstract
A di-ionizable p-tert-butylcalix[4]arene-1,3-thiacrown-5 ether extractant was synthesized. Its cone conformation and polyether ring attachment regioselectivity were verified by NMR spectroscopy. The metal ion-complexing properties of this ligand were evaluated by solvent extractions of metal cations from aqueous solutions into chloroform. The ligand was found to be an efficient extractant with Ba2+ selectivity in competitive solvent extraction of alkaline earth metal cations. It also exhibits high extraction ability for Pb2+ and for Hg2+ in single species solvent extractions.
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We thank the Division of Chemical Sciences, Geosciences and Biosciences of the Office of Basic Energy Sciences of the U.S. Department of Energy (Grant DE-FG02-90ER14416) for support of this research.
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Tu, C., Surowiec, K. & Bartsch, R.A. Novel calix[4]arene-thiacrown ether for selective and efficient extraction of Ba(II), Pb(II), and Hg(II). J Incl Phenom Macrocycl Chem 58, 361–366 (2007). https://doi.org/10.1007/s10847-006-9283-y
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DOI: https://doi.org/10.1007/s10847-006-9283-y