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Spectroscopic Characterization of Tetravalent Berkelium
Joshua J Woods1, Jennifer N Wacker1, S Olivia Gunther1
1Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
Angewandte Chemie (International Ed. in English)
|March 10, 2026
Summary
Researchers stabilized tetravalent berkelium (BkIV) using novel chelators, overcoming previous beam reduction issues. This breakthrough enables further study of berkelium and other transplutonium element complexation behavior.
Area of Science:
- Radiochemistry
- Inorganic Chemistry
- Spectroscopy
Background:
- Tetravalent berkelium (BkIV) is challenging to stabilize due to its susceptibility to reduction.
- Understanding BkIV complexation is crucial for exploring the chemistry of transplutonium elements.
Purpose of the Study:
- To stabilize and characterize tetravalent berkelium (BkIV) complexes using siderophore-inspired chelators.
- To investigate the electronic structure and coordination behavior of BkIV with organic ligands.
Main Methods:
- X-ray absorption spectroscopy (XAS), including extended X-ray absorption fine structure (EXAFS).
- Absorption and luminescence spectroscopies.
- Surrogate experiments using cerium (Ce) as a lanthanide counterpart.
- Computational calculations.
Main Results:
- Stabilization of BkIV under mild conditions using novel chelators, confirmed by spectroscopy.
- BkIV complexes resisted in situ beam reduction under X-ray irradiation due to cryogenic measurements.
- BkIV-O interatomic distances were determined by EXAFS, providing insights into coordination.
Conclusions:
- The developed method successfully stabilizes BkIV, enabling detailed spectroscopic and structural studies.
- These findings advance the understanding of 5f element complexation and electronic structures.
- Paves the way for future research on transplutonium compounds.
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