Structural and Spectroscopic Characterization of Plutonium and Other Tetravalent Metals Complexed to a Keggin Ion
Journal Article
·
· Inorganic Chemistry
- Oregon State Univ., Corvallis, OR (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sandia National Laboratories (SNL), Livermore, CA (United States)
- Oregon State Univ., Corvallis, OR (United States)
Here, we report the isolation of the first plutonium(IV) complex with a Keggin ion chelator: Cs20[Pu(PW11O39)2]2·13H2O. Single crystal XRD and solid-state UV–vis absorbance analysis demonstrate the stabilization of Pu4+ by the Keggin ligand. The unit cell contains two [Pu(PW11O39)2]10– complexes (Pu(PW11)2) bridged by Cs+. Raman and 31P NMR spectra of Pu(PW11)2 are consistent with the analogous Zr4+, Hf4+, Ce4+, and Th4+ complexes. The Pu–O bond distances at the two Pu sites are 2.35(3) and 2.34(3) Å, matching the value extrapolated from the bonding trend built with the other 8-coordinated tetravalent cations. However, the long-range arrangement of the Pu(PW11)2 complexes within the lattice is unique in the series of MIV(PW11)2 compounds: pairs of Pu(PW11)2 are organized perpendicular to each other. Based on solution-state UV–visible absorbance, small-angle X-ray scattering (SAXS), and 31P NMR, the tetravalent cations quantitatively form the 1:2 species in solution ([Pu(PW11O39)2]10–(aq)) and no 1:1 species ([Pu(PW11O39)(H2O)x]3–(aq)). Finally, a linear correlation exists between the metal–oxygen distances in the MIV(PW11)2 compounds and the corresponding metal dioxides, allowing for extrapolation for Pa4+, Am4+, and Bk4+. The results indicate that our microscale POM approach represents a viable pathway to probe properties of rare actinide ions in discrete molecules, beyond the traditional oxide extended solids.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC52-07NA27344; NA0003525
- OSTI ID:
- 3003811
- Report Number(s):
- LLNL--JRNL-2009847
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry; ISSN 0020-1669; ISSN 1520-510X
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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