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A molecular basis to rare earth separations for recycling: tuning the TriNOx ligand properties for improved performance
- Cole, Bren E., Falcones, Ingemar B., Cheisson, Thibault, Manor, Brian C., Carroll, Patrick J., Schelter, Eric J.
- Chemical communications 2018 v.54 no.73 pp. 10276-10279
- benzene, cations, dimerization, hydroxylamine, ligands, recycling, toluene
- A methoxy-substituted tripodal hydroxylamine ligand, H₃TriNOxᴼᴹᵉ, was synthesized and coordinated to rare earth cations for separation purposes. Metrics of the resulting complexes were investigated and compared with their parent TriNOx³⁻ counterparts for determination of the molecular basis for the described rare earth separation system. Addition of an electron donating group to the aryl backbone resulted in a more electron rich ligand that increased the equilbrium constant for complex dimerization five-fold. The new separation system yielded efficient Nd/Dy separations in toluene rather than benzene.