Stabilization of actinides and lanthanides in unusually high oxidation states

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Chemical environments can be chosen which stabilize actinides and lanthanides in unusually high or low oxidation states and in unusual coordination. In many cases, one can rationalize the observed species as resulting from strong charge/size influences provided by specific sites in host lattices (e.g., Tb(IV) in BaTbO/sub 3/ or Am(IV) in polytungstate anions). In other cases, the unusual species can be considered from an acid-base viewpoint (e.g., U(III) in AsF/sub 5//HF solution or Pu(VII) in Li/sub 5/PuO/sub 6/). In still other cases, an interplay of steric and redox effects can lead to interesting comparisons (e.g., instability of double fluoride salts ... continued below

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Pages: 35

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Eller, P.G. & Penneman, R.A. January 1, 1986.

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Description

Chemical environments can be chosen which stabilize actinides and lanthanides in unusually high or low oxidation states and in unusual coordination. In many cases, one can rationalize the observed species as resulting from strong charge/size influences provided by specific sites in host lattices (e.g., Tb(IV) in BaTbO/sub 3/ or Am(IV) in polytungstate anions). In other cases, the unusual species can be considered from an acid-base viewpoint (e.g., U(III) in AsF/sub 5//HF solution or Pu(VII) in Li/sub 5/PuO/sub 6/). In still other cases, an interplay of steric and redox effects can lead to interesting comparisons (e.g., instability of double fluoride salts of Pu(V) and Pu(VI) relative to U, Np, and Am analogues). Generalized ways to rationalize compounds containing actinides and lanthanides in unusual valences (particularly high valences), including the above and numerous other examples, will form the focus of this paper. Recently developed methods for synthesizing high valent f-element fluorides using superoxidizers and superacids at low temperatures will also be described. 65 refs., 8 figs., 9 tabs.

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Pages: 35

Notes

NTIS, PC A03/MF A01; 1.

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  • 17. rare earth research conference, Hamilton, Ontario, Canada, 8 Jun 1986

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  • Other: DE86012376
  • Report No.: LA-UR-86-2000
  • Report No.: CONF-860602-4
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5629735
  • Archival Resource Key: ark:/67531/metadc1093777

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  • January 1, 1986

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 30, 2018, 1:18 p.m.

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Eller, P.G. & Penneman, R.A. Stabilization of actinides and lanthanides in unusually high oxidation states, article, January 1, 1986; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1093777/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.