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Anion-Regulated Lithium Isotope Separation with Crown Ethers Via Tuning Coordination Environments
Bo Yang1,2, Li Cui1,2, Hefeng Yuan1,2
1Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China.
Inorganic Chemistry
|June 2, 2026
Summary
Anions control lithium isotope separation by altering the Li+ coordination environment. Charge-delocalized anions balance bonding, enhancing the separation factor for sustainable nuclear energy applications.
Area of Science:
- Nuclear chemistry
- Isotope separation science
Background:
- Efficient separation of lithium isotopes (Li-6 and Li-7) is crucial for nuclear energy.
- Crown ether systems show promise for lithium isotope separation, but the role of anions is not well understood.
- Understanding anion mechanisms is key to designing improved separation systems.
Purpose of the Study:
- To elucidate the molecular-level mechanism by which anions influence lithium isotope separation.
- To provide theoretical guidance for optimizing lithium isotope separation systems.
Main Methods:
- Combined Li-6/Li-7 separation experiments.
- Lithium-7 nuclear magnetic resonance (NMR) spectroscopy.
- Quantum chemical calculations.
Main Results:
- Anions modulate the Li+ coordination microenvironment, directly impacting the separation factor.
- Charge-delocalized anions create a balanced coordination environment, enhancing the thermodynamic driving force for Li isotope exchange.
- Optimized anion interactions significantly increased the lithium isotope separation coefficient.
Conclusions:
- Anions are critical in controlling lithium isotope separation performance through microenvironment manipulation.
- This study offers a screening method and theoretical framework for designing advanced lithium isotope separation technologies.
- Findings pave the way for more efficient systems vital for sustainable nuclear energy.
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