Unusual structure, bonding and properties in a californium borate
The participation of the valence orbitals of actinides in bonding has been debated for decades. Recent experimental and computational investigations demonstrated the involvement of 6p, 6d and/or 5f orbitals in bonding. However, structural and spectroscopic data, as well as theory, indicate a decrease in covalency across the actinide series, and the evidence points to highly ionic, lanthanide-like bonding for late actinides. Here we show that chemical differentiation between californium and lanthanides can be achieved by using ligands that are both highly polarizable and substantially rearrange on complexation. A ligand that suits both of these desired properties is polyborate. We demonstrate that the 5f, 6d and 7p orbitals are all involved in bonding in a Cf(III) borate, and that large crystal-field effects are present. Synthetic, structural and spectroscopic data are complemented by quantum mechanical calculations to support these observations.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- USDOE Office of Science - Office of Basic Energy Sciences - Chemical Sciences, Geosciences, and Biosciences Division
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1393977
- Journal Information:
- Nature Chemistry, Journal Name: Nature Chemistry Journal Issue: 5 Vol. 6; ISSN 1755-4330
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
Rare earth separations by selective borate crystallization
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journal | March 2017 |
Emergence of californium as the second transitional element in the actinide series
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journal | April 2015 |
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