title: Identification of the Formal +2 Oxidation State of Plutonium: Synthesis and Characterization of {PuII[C5H3(SiMe3)2]3}<sup/>.
abstract: Over 70 years of chemical investigations have shown that plutonium exhibits some of the most complicated chemistry in the periodic table. Six Pu oxidation states have been unambiguously confirmed (0 and +3 to +7), and four different oxidation states can exist simultaneously in solution. We report a new formal oxidation state for plutonium, namely Pu2+in [K(2.2.2-cryptand)][PuIICp″3], Cp″ = C5H3(SiMe3)2. The synthetic precursor PuIIICp″3is also reported, comprising the first structural characterization of a Pu-C bond. Absorption spectroscopy and DFT calculations indicate that the Pu2+ion has predominantly a 5f6electron configuration with some 6d mixing.
authors.affiliation: Department of Chemistry, University of California , Irvine, California 92697-2025, United States.
authors.forename: Cory J
authors.initials: CJ
authors.lastname: Windorff
authors.affiliation: Department of Chemistry, University of California , Irvine, California 92697-2025, United States.
authors.forename: Guo P
authors.initials: GP
authors.lastname: Chen
authors.forename: Justin N
authors.initials: JN
authors.lastname: Cross
authors.affiliation: Department of Chemistry, University of California , Irvine, California 92697-2025, United States.
authors.forename: William J
authors.identifier: 0000-0002-0651-418X
authors.initials: WJ
authors.lastname: Evans
authors.affiliation: Department of Chemistry, University of California , Irvine, California 92697-2025, United States.
authors.forename: Filipp
authors.identifier: 0000-0001-8520-3971
authors.initials: F
authors.lastname: Furche
authors.forename: Andrew J
authors.identifier: 0000-0001-9679-6020
authors.initials: AJ
authors.lastname: Gaunt
authors.forename: Michael T
authors.initials: MT
authors.lastname: Janicke
authors.forename: Stosh A
authors.initials: SA
authors.lastname: Kozimor
authors.forename: Brian L
authors.initials: BL
authors.lastname: Scott