Novel calix[4]arene-thiacrown ether for selective and efficient extraction of Ba(II), Pb(II), and Hg(II) |
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| Authors: | Chuqiao Tu Kazimierz Surowiec Richard A Bartsch |
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| Institution: | (1) Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA |
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| Abstract: | A di-ionizable p-tert-butylcalix4]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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| Keywords: | Calixarenes Crown compounds Molecular recognition Metal ion extraction |
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