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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Updated: Feb 28, 2026

Isolating and Incorporating Light-Harvesting Antennas from Diatom Cyclotella Meneghiniana in Liposomes with Thylakoid Lipids

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Rigidified cyclic diglycolamides: coordination and extraction of trivalent f-elements.

Mariia V Evsiunina^1,2, Mikhail A Kalinin², Paulina Kalle³

¹Department of Chemistry, MSU-BIT University, Shenzhen 517182, China.

Dalton Transactions (Cambridge, England : 2003)

|February 27, 2026

Summary

Cyclic diglycolamides (DGAs) show promise for managing nuclear waste by improving actinide and lanthanide separation. Ligand cyclization enhances coordination and extraction, offering a new strategy for safe nuclear waste reprocessing.

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Area of Science:

Nuclear Chemistry
Materials Science
Chemical Engineering

Background:

Nuclear energy reduces greenhouse gases, but spent fuel reprocessing creates high-level waste.
Diglycolamides (DGAs) are CHON-compliant extractants for actinide/lanthanide separation.
Ligand structure, flexibility, and preorganization critically influence DGA extraction performance.

Purpose of the Study:

To design and synthesize novel cyclic diglycolamide ligands.
To investigate the coordination behavior and extraction properties of these cyclic DGAs.
To evaluate the impact of ligand cyclization on f-element separation for nuclear waste management.

Main Methods:

Computational modeling for ligand design.
Synthesis of cyclic diglycolamide ligands (L1-L4).
NMR titration for solution coordination studies.
Single-crystal X-ray diffraction for solid-state structural analysis.
Systematic evaluation of extraction performance for trivalent f-elements.

Main Results:

Successful design and synthesis of four new cyclic DGA ligands.
Detailed characterization of ligand coordination behavior in solution and solid state.
Identification of novel lanthanum complex formations with 1:1 and 2:1 ligand-to-metal stoichiometries.
Demonstration that ligand cyclization significantly alters coordination modes and extraction efficiency.

Conclusions:

Cyclic DGA ligands offer enhanced control over coordination and extraction properties.
Ligand cyclization is a viable strategy to optimize extractants for nuclear waste reprocessing.
These findings highlight the potential of cyclic DGAs in advanced nuclear waste management solutions.