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

Brett M. Rambo, Sung Kuk Kim, Jong Seung Kim, Christopher W. Bielawski, Jonathan L. Sessler

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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 - > Br- ≫ Cl- or F -).

Original languageEnglish
Pages (from-to)716-722
Number of pages7
JournalChemical Science
Issue number6
Publication statusPublished - 2010 Dec 1


ASJC Scopus subject areas

  • Chemistry(all)

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