Abstract
A regioisomer of a previously reported p-tert-butylcalix[4]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-butylcalix[4]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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Acknowledgment
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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Yang, Y., Cao, X., Surowiec, K. et al. Calix[4]arene-thiacrown-5 di(carboxylic acid) regioisomers as metal ion extractants. J Incl Phenom Macrocycl Chem 66, 163–169 (2010). https://doi.org/10.1007/s10847-009-9675-x
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DOI: https://doi.org/10.1007/s10847-009-9675-x