Abstract
The extraction of three shape-persistent aromatic oligoamide macrocycles (cycloaramides) bearing either apolar or polar side chains at the periphery of the rings has been investigated towards some representative lanthanide and actinide ions, and alkali metal ions. The results from the liquid–liquid extraction of lanthanide and thorium ions from aqueous solutions into dichloromethane revealed remarkably high extractability of up to 99% and selectivity over alkali metal cations. The stoichiometry of the complex formed between the macrocycle and Eu3+ or Th4+ was determined to be 1:1.
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Acknowledgments
This work is supported by the National Natural Science Foundation (20774059, 20672078) and the Doctoral Program of the Ministry of Education of China (20090181110047). Analytical & Testing Center of Sichuan University is acknowledged for technical assistance of NMR experiments.
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Zhong, L., Chen, L., Feng, W. et al. Shape-persistent macrocycles: efficient extraction towards lanthanide and actinide elements. J Incl Phenom Macrocycl Chem 72, 367–373 (2012). https://doi.org/10.1007/s10847-011-9991-9
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DOI: https://doi.org/10.1007/s10847-011-9991-9