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Ionic Liquid as a N,O-Donor Ligand-Based Extraction System Modifier: Establishing the Mechanism of
M A Gerasimov1, A S Pozdeev2, M V Evsiunina1
1Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
Inorganic Chemistry
|January 18, 2024
Summary
This study explores f-element separation using a novel ligand and fluorinated solvents. The mixed solvent system enhanced americium(III) selectivity over lanthanides(III), improving extraction efficiency.
Area of Science:
- Radiochemistry
- Separation Science
- Coordination Chemistry
Background:
- Efficient separation of f-elements is crucial for nuclear fuel reprocessing and waste management.
- Developing selective extraction systems requires advanced ligands and suitable organic solvents.
Purpose of the Study:
- To investigate novel extraction systems for f-element separation.
- To evaluate the performance of a tetradentate N,O-donor ligand with fluorinated solvents.
- To understand the complexation mechanism for enhanced selectivity.
Main Methods:
- Solvent extraction using di(N-ethyl-4-ethylanilide) 2,2'-dipyridyl-6,6'-dicarboxylic acid (L).
- Utilized organic phases: metanitrobenzotrifluoride (F-3), ionic liquid (C4mimNTf2, IL), and their mixture.
- Characterization techniques included UV-visible spectroscopy, Raman spectroscopy, XRD, and DFT calculations.
Main Results:
- The mixed solvent system (F-3/IL) demonstrated increased selectivity for Am(III) separation in the presence of Ln(III).
- Complexation studies revealed insights into the mechanism driving the improved extraction properties.
- The ligand L showed promise for selective f-element partitioning.
Conclusions:
- The developed extraction system, particularly with the mixed diluent, offers enhanced selectivity for Am(III) over Ln(III).
- Understanding the complexation mechanism aids in designing more efficient f-element separation processes.
- Fluorine-containing solvents and ionic liquids show potential in advanced separation technologies.
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