期刊
CHEMPHYSCHEM
卷 17, 期 14, 页码 2112-2117出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201600305
关键词
coordination chemistry; metal extraction; self-assembly; supramolecular chemistry; weak interactions
资金
- ACF/SEPOU project of the Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA)
Tuning the affinity of a medium for a given metallic cation with the sole modification of weak interactions is a challenge for molecular recognition. Solvent extraction is a key technique employed in the recovery and purification of valuable metals, and it is facing an increased complexity of metal fluxes to deal with. The selectivity of such processes generally relies on the use of specific ligands, designed after their coordination chemistry. In the present study, we illustrate the possibility to employ the sole control of weak interactions to achieve the selective extraction of Pd-II over Nd-III: the control over selectivity is obtained by tuning the self-assembly of the organic phase. A model is proposed, after detailed experimental analysis of molecular (XRD, NMR) and supra-molecular (SAXS) features of the organic phases. We thus demonstrate that PdII extraction is driven by metal coordination, whereas NdIII extraction requires aggregation of the extractant in addition to metal coordination. These results are of general interest for the applications which rely on the stabilization of metals in organic phases.
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