Calix[4]arene-thiacrown-5 di(carboxylic acid) regioisomers as metal ion extractants |
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| Authors: | Yanfei Yang Xiaodan Cao 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 regioisomer of a previously reported p-tert-butylcalix4]arene-1,3-thiacrown-5 di(carboxylic acid) is prepared in which the thiacrown ring attachment sites are moved from distal phenolic oxygens of a cone p-tert-butylcalix4]arene scaffold to proximal phenolic oxygens. The influence of this structural variation in the di-ionizable calixcrown ligand on competitive solvent extractions of alkali metal cations and of alkaline earth metal cations and single species solvent extractions of Hg2+ and Pb2+ from aqueous solutions into chloroform is evaluated. |
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