1996
DOI: 10.1021/ic9511231
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Characterization of Aqueous Plutonium(IV) Nitrate Complexes by Extended X-ray Absorption Fine Structure Spectroscopy

Abstract: The structures of the aqueous nitrate complexes of Pu(IV) have been studied by extended X-ray absorption fine-structure (EXAFS) at nitric acid concentrations of 3, 8, and 13 M. Systematic changes in the EXAFS spectra demonstrate the trends of increasing nitrate ligation and decreasing water ligation as a function of increasing nitric acid concentration. The coordination numbers of the nitrogens and noncoordinating oxygens are consistent with previous studies in which the principal species were found to be the … Show more

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Cited by 76 publications
(67 citation statements)
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“…The pattern from the initial stock solution was modeled with Gaussian peaks and assigned ligation based on the structure of the dimer and previously published extended XAFS data on similar solutions. 35 The partially resolved peak at 2.88(1) Å is attributed to bidentate- Figure 1. Illustration of the hydroxo-bridged Pu IV dimer of 1, the same structure as that seen for 2.…”
Section: ■ Experimental Methodsmentioning
confidence: 99%
“…The pattern from the initial stock solution was modeled with Gaussian peaks and assigned ligation based on the structure of the dimer and previously published extended XAFS data on similar solutions. 35 The partially resolved peak at 2.88(1) Å is attributed to bidentate- Figure 1. Illustration of the hydroxo-bridged Pu IV dimer of 1, the same structure as that seen for 2.…”
Section: ■ Experimental Methodsmentioning
confidence: 99%
“…The structures of the Pu(IV) complexes in aqueous solution have been studied by experimental and theoretical methods [31][32][33][34]. Extended X-ray absorption fine structure (EXAFS) studies [31,34] show that the Pu−O average bond distance is approximately 2.39 Å, which indicates that in aqueous solution Pu 4+ is nine-coordinate.…”
Section: Pu(iv) Aquo and Nitrate Complexesmentioning
confidence: 99%
“…However, experiments with transuranics have been very limited in number (Kalkowski, Kaindl, Bertram et al, 1987;Petit-Maire et al, 1989;Combes et al, 1992). In 1993 a US Department of Energy review established the fundamental basis of experimental and safety procedures for transuranic experiments at the Stanford Synchrotron Radiation Laboratory (SSRL), which enabled several EXAFS studies of solutions and solids containing Np and Pu (Allen, Veirs et al, 1996;Allen et al, 1997;Clark et al, 1997Clark et al, , 1998Conradson, 1998;Den Auwer et al, 1999). At SSRL the maximum allowed quantity of 237 Np in the experimental X-ray hutch at any one time must be less than 50 mCi.…”
Section: Synchrotron Radiation Beamlines For Studying Radioactive Matmentioning
confidence: 99%