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 Post subject: Protactinium Research
PostPosted: Nov 17, 2014 1:55 pm 
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Joined: Nov 30, 2006 3:30 pm
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Location: Alabama
EXAFS Study of the Speciation of Protactinium(V) in Aqueous Hydrofluoric Acid Solutions

The speciation of protactinium(V) in hydrofluoric acid (HF) solutions was studied using X-ray absorption spectroscopy. Extended X-ray absorption fine structure measurements were performed on an aqueous solution of 0.05 M protactinium(V) with various HF concentrations ranging from 0.5 to 27 M in order to probe the protactinium coordination sphere with respect to the identity and number of coordinating ligands. The resulting fits to the spectra suggest the presence of an eight-coordinate homoleptic fluoro complex in highly concentrated fluoride solutions (27 M), with equilibrium between seven- and eight-coordinate fluoro complexes at moderate acidities, and in more dilute solutions, results indicate that one water molecule is likely to replace a fluoride in the first coordination sphere, at a distance of 2.54–2.57 Å. Comparisons of this chemistry with group V metals, niobium and tantalum, are presented, and the potential implications for these results on the hydrolytic behavior of protactinium in aqueous systems are discussed.

PostPosted: Nov 19, 2014 6:22 pm 

Joined: Jul 28, 2008 10:44 pm
Posts: 3069
Yet another completely foreign language to me at least :(

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