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Unusual structure, bonding and properties in a californium borate

Journal Article · · Nature Chemistry
DOI:https://doi.org/10.1038/nchem.1896· OSTI ID:1393977

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

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Cited By (2)

Rare earth separations by selective borate crystallization journal March 2017
Emergence of californium as the second transitional element in the actinide series journal April 2015


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