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Metal Recognition Driven by Weak Interactions: A Case Study in Solvent Extraction
Author(s) -
Poirot Rémi,
Le Goff Xavier,
Diat Olivier,
Bourgeois Damien,
Meyer Daniel
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600305
Subject(s) - extraction (chemistry) , metal , solvent extraction , solvent , chemistry , molecular recognition , solvent effects , materials science , chromatography , organic chemistry , molecule
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 Pd II extraction is driven by metal coordination, whereas Nd III 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.