Assessing the mechanism of the synergistic action of calixarenes and Co-dicarbollides in lanthanide extractions

作者：Macerata Elena; Castiglione Franca; Panzeri Walter; Mariani Mario; Sansone Francesco; Casnati Alessandro^*; Mele Andrea

来源：New Journal of Chemistry, 2010, 34(11): 2552-2557.

DOI：10.1039/c0nj00269k

The extraction pathway of lanthanide ions from simulated nuclear waste solutions and the synergistic effects of a calixarene and a cobalt dicarbollide anion (CD) have been investigated on a model system by the combined use of electrospray ionization MS, FTMS ICR, together with (1)H and (11)B high field NMR spectroscopy techniques. Moreover, the extracting capabilities of the calixarene/BrCD mixture were determined by liquid-liquid extraction tests. An enhanced extraction efficiency of the calixarene/BrCD mixture with respect to the calixarene alone was observed. MS analysis allowed the assessment of a supramolecular ternary association, while the NMR data gave information on the calixarene binding sites for lanthanide ions. Herein, we report the experimental evidence of the formation of a ternary lanthanide/calixarene/Co-dicarbollide aggregate, which allowed us for the first time to assess the mechanism of the synergistic action of calixarenes and CD anions in lanthanide ion extraction.

• 出版日期2010