First structural characterization of a protactinium(V) single oxo bond in aqueous media.
The present work describes the first structural studies of protactinium(V) in sulfuric and hydrofluoric acid media using X-ray absorption spectroscopy. The results show unambiguously the absence of the trans-dioxo bond that characterizes the other early actinide elements such as U and Np. In concentrated sulfuric acid (13 M), Pa(V) is proved to exhibit a single oxo bond as postulated in the literature for species in more dilute media. In a 0.5 M HF medium, XANES and EXAFS spectra indicate the absence of any oxo bond: Pa(V) exists in the form of a pure fluoro complex.
Le Naour
Claire
C
Centre National de la Recherche Scientifique/IN2P3/Paris XI, Institut de Physique Nucléaire, 91406 Orsay Cedex, France.
Trubert
Didier
D
Di Giandomenico
Maria V
MV
Fillaux
Clara
C
Den Auwer
Christophe
C
Moisy
Philippe
P
Hennig
Christoph
C