EXAFS Study of Uranyl Nitrate Dimer at High and Low Temperature

X-ray absorption spectroscopy (XAS) has become an increasingly important technique for the study and characterization of metal species in materials, heterogeneous catalysts, and bioinorganic substrates. More recently, a number of environmental applications have also been reported in which informatio...

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Bibliographic Details
Published in:Inorganic chemistry 2000-02, Vol.39 (4), p.862-864
Main Authors: Barnes, Craig E, Shin, Yongsoon, Saengkerdsub, Suree, Dai, Sheng
Format: Article
Language:English
Subjects:
DIMERS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MOLECULAR STRUCTURE
TEMPERATURE DEPENDENCE
URANYL NITRATES
X-RAY SPECTROSCOPY
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Summary:X-ray absorption spectroscopy (XAS) has become an increasingly important technique for the study and characterization of metal species in materials, heterogeneous catalysts, and bioinorganic substrates. More recently, a number of environmental applications have also been reported in which information concerning the local coordination sphere around transuranium elements has been obtained from both near edge (XANES) and fine structure (EXAFS) studies. This paper describes EXAFS studies on the hydroxy-bridged uranyl nitrate dimer HIm{sub 2}[{l{underscore}brace}UO{sub 2}({mu}-OH)(NO{sub 3}){sub 2}{r{underscore}brace}{sub 2}] (1) (HIm = imidazolium (C{sub 3}H{sub 5}N{sub 2})), which are used to model possible species found in vitreous glasses used in the safe, long-term storage of transuranic wastes. A pronounced temperature effect on the U{hor{underscore}ellipsis}U feature in the XAS spectrum of 1 was observed. Complete interpretation and analysis of the EXAFS observed for this complex are described.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic9904992