Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 647, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129089
Keywords
Preorganized ligands; Phenanthroline; Lanthanides separation; Binding thermodynamics
Categories
Funding
- Start-up Program of Institute of Process Engineering, IPE Talent Program-Category B [E0297902]
- State Key Laboratory of Biochemical Engineering [E1297901]
- National Natural Science Foundation of China [21822606, 21790372]
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Rare earth elements are crucial for high-tech industry and homeland security. A new synthetic approach has been developed for PhenDA derivatives to broaden their functional group scope and enhance the discrimination ability towards Lns elements.
Rare earth elements (REEs) are vitally important for both high-tech industry and homeland security. Current industrial production and purification of REEs rely mostly on solvent extraction, for which, the overall extraction efficiency is largely determined by the organic ligands used as extractants. Ligands based on 1,10-phenantroline-2,9-diamides (PhenDA) are promising candidates and have been intensively investigated for both lanthanides (Lns) and/or lanthanides/actinides (Lns/Ans) separations. The synthetic drawback for current PhenDA derivatives lies in the equivalent usage of acyl chloride for the key precursors, thus limiting functional group tolerance and large-scale production of the extractants. Herein, we have demonstrated a new synthetic approach for mild reaction condition, high-yield synthesis of various types of PhenDA derivatives ranging from alkyl, aromatic to amino acid substituents. The synthetic procedures are relatively green for the absence of corrosive, volatile reagents and easy of product purification. The in-group Lns discrimination of one ligand is investigated in detail to demonstrate the separation potential. Considering the broad functional group tolerance of the current method and ease of large-scale production, we believe the methodology will broaden the ligands scope based on PhenDA and inspire new functionalities of Lns complexes.
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