Emergence of californium as the second transitional element in the actinide series

Samantha K. Cary, Monica Vasiliu, Ryan E. Baumbach, Jared T. Stritzinger, Thomas D. Green, Kariem Diefenbach, Justin N. Cross, Kenneth L. Knappenberger, Guokui Liu, Mark A. Silver, A. Eugene Deprince, Matthew J. Polinski, Shelley M. Van Cleve, Jane H. House, Naoki Kikugawa, Andrew Gallagher, Alexandra A. Arico, David A. Dixon, Thomas E. Albrecht-Schmitt

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105 Scopus citations

Abstract

A break in periodicity occurs in the actinide series between plutonium and americium as the result of the localization of 5f electrons. The subsequent chemistry of later actinides is thought to closely parallel lanthanides in that bonding is expected to be ionic and complexation should not substantially alter the electronic structure of the metal ions. Here we demonstrate that ligation of californium(III) by a pyridine derivative results in significant deviations in the properties of the resultant complex with respect to that predicted for the free ion. We expand on this by characterizing the americium and curium analogues for comparison, and show that these pronounced effects result from a second transition in periodicity in the actinide series that occurs, in part, because of the stabilization of the divalent oxidation state. The metastability of californium(II) is responsible for many of the unusual properties of californium including the green photoluminescence.

Original languageEnglish
Article number6827
JournalNature Communications
Volume6
DOIs
StatePublished - Apr 16 2015
Externally publishedYes

Funding

This material is based on work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Heavy Elements Chemistry Program, under Award Number DE-FG02-13ER16414 (TEA-S) and DE-AC02-06CH11357 (GL and DAD). We are especially grateful for the assistance and supervision by the Office of Environmental Health and Safety at FSU; specifically Jason A. Johnson and Ashley L. Gray of the Office of Radiation Safety for their facilitation of these studies. D.A.D. thanks the Robert Ramsay Chair Fund of The University of Alabama for partial support. The isotopes used in this research were supplied by the U.S. Department of Energy, Office of Science, by the Isotope Program in the Office of Nuclear Physics. The 243Am, 248Cm and 249Cf were provided to Florida State University via the Isotope Development and Production for Research and Applications Program through the Radiochemical Engineering and Development Center at Oak Ridge National Laboratory. The 249Cf was purchased via the Gregory R. Choppin Chair Endowment. Magnetization measurements using the VSM SQUID MPMS were performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the State of Florida, and the U.S. Department of Energy.

FundersFunder number
State of Florida
TEA-SDE-AC02-06CH11357
National Science FoundationDMR-1157490
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences1157490
Office of Science
Basic Energy SciencesDE-FG02-13ER16414
Nuclear Physics
University of Alabama

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