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Title: Structural study of the ammonium octafluoroneptunate, [NH4]4NpF8

Journal Article · · Inorganica Chimica Acta
 [1];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Health Physics
  5. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States)
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The [NH4]4NpF8 salt was prepared from the solid-state reaction of NpO2 with NH4HF2 and characterized by powder X-ray diffraction and X-ray absorption fine structure spectroscopy. The diffraction results confirm the compound to be isostructural to [NH4]4UF8 with the following lattice parameter (a = 13.054(4) Å, b = 6.681(2) Å, c = 13.676(5) Å, ß = 121.14 Å). For the first time, a Neptunium fluoride complex has been characterized by XAFS spectroscopy. The energy position of the white line and inflection of the XANES spectra of [NH4]4NpF8 are consistent with the presence of Np(IV). Adjustment of the EXAFS spectra indicates that the coordination number (7.4±1.5) and the average Np-F distance (2.26(1) Å) are consistent with the presence of the NpF8 dodecahedron. The average Np-F distance is ~0.02 Å shorter than the U-F distance in [NH4]4UF8 and is a result of the actinide contraction.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1330088
Alternate ID(s):
OSTI ID: 1359174
Journal Information:
Inorganica Chimica Acta, Vol. 448, Issue C; ISSN 0020-1693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
EXAFS
Fluoride
Neptunium