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Issue 6, 2010
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A benzocrown-6-calix[4]arene methacrylate copolymer: Selective extraction of caesium ions from a multi-component system

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Abstract

The synthesis and extraction properties of a copolymer comprised of a 10:1 molar ratio of methyl methacrylate (MMA) and a methacrylate functionalized benzocrown-6-calix[4]arene are reported. Under aqueous-dichloromethane liquid–liquid extraction conditions, the copolymer displayed an enhanced selectivity for caesium over sodium and potassium (in the form of their picrate salts) as compared to an appropriate small molecule analogue. Further, the copolymer was capable of removing caesium nitrate from aqueous solution in the presence of various other anionic (e.g., F, Cl, and SO4) and cationic species (e.g., K+ and Na+). The ability of this polymeric system to extract inorganic caesium salts into dichloromethane from aqueous media scaled with the relative hydration energies (ΔhydG°) of each anion studied (i.e., NO3 > BrCl or F).

Graphical abstract: A benzocrown-6-calix[4]arene methacrylate copolymer: Selective extraction of caesium ions from a multi-component system

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Publication details

The article was received on 29 Jul 2010, accepted on 20 Sep 2010 and first published on 19 Oct 2010


Article type: Edge Article
DOI: 10.1039/C0SC00396D
Citation: Chem. Sci., 2010,1, 716-722
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    A benzocrown-6-calix[4]arene methacrylate copolymer: Selective extraction of caesium ions from a multi-component system

    B. M. Rambo, S. K. Kim, J. S. Kim, C. W. Bielawski and J. L. Sessler, Chem. Sci., 2010, 1, 716
    DOI: 10.1039/C0SC00396D

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