Selective Binding and Precipitation of Cesium Ions from Aqueous Solutions: A Size-Driven Supramolecular Reaction

Ravell Bengiat, Benny Bogoslavsky, Daniel Mandler, Joseph Almog*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The nuclear disasters of Chernobyl and Fukushima presented an urgent need for finding solutions to treatment of radioactive wastes. Among the by-products of nuclear fission is radioactive 137Cs, which evokes an environmental hazard due to its long half-life (>30 years) and high solubility in water. In this work, a water-soluble organic ligand, readily obtained from alloxan and 1,3,5-benzenetriol, has been found to selectively bind and precipitate Cs+ ions from aqueous solutions. The special rigid structure of the ligand, which consists of a “tripodal” carbonyl base above and below an aromatic plane, contributes to the size-driven selectivity towards the large Cs+ ions and the formation of a giant, insoluble supramolecular complex. In addition to the low costs of the ligand, high yields and effectiveness in precipitating Cs+ ions, the Cs-complex revealed a high endurance to continuous doses of γ-radiation, increasing its potential to act as a precipitating agent for 137Cs.

Original languageAmerican English
Pages (from-to)3161-3164
Number of pages4
JournalChemistry - A European Journal
Issue number13
StatePublished - 2 Mar 2018

Bibliographical note

Funding Information:
This research was supported by the Pazy Research Foundation. The authors would like to thank the Irradiation Group at Ben Gurion University, Beer-Sheva, for their help and assistance with the irradiation experiments.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


  • alloxan
  • nuclear waste
  • radioactive cesium
  • supramolecular chemistry
  • tripodal ligands


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