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Solution coordinati...
Solution coordination chemistry of uranium in the binary UO22+-SO42- and the ternary UO22+-SO42--OH- system
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Moll, H. (författare)
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Reich, T. (författare)
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Hennig, C. (författare)
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Rossberg, A. (författare)
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- Szabo, Zoltan (författare)
- KTH,Oorganisk kemi
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Grenthe, I. (författare)
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(creator_code:org_t)
- 2009-09-25
- 2006
- Engelska.
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Ingår i: Radiochimica Acta. - : Walter de Gruyter GmbH. - 0033-8230 .- 2193-3405. ; 88:11-sep, s. 559-566
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The structure and reaction dynamics in the systems UO22+-SO42- and UO22+-SO42--OH- were investigated using EXAFS and O-17-NMR spectroscopy. Uranium Lm edge EXAFS indicated a bidentate coordination mode of sulfate to uranyl. In solution, this is characterized by an U-S distance of 3.11 Angstrom. Approximately 5 oxygen atoms were observed in the equatorial plane at 2.39-2.43 Angstrom. The kinetics in the binary uranyl sulfate system can be described by four dominant exchange reactions: (1) UO22++SO(4)(2-)reversible arrow UO2SO4(k(1)), (2) U*O-2(2+)+UO(2)SO(4)reversible arrowU*O2SO4+UO22+(k(2)), (3) UO22++UO2(SO4)(2)(2-)reversible arrow 2UO(2)SO(4)(k(3)), and (4) UO2SO4+SO42-reversible arrowUO2(SO4)(2)(2-)(k(4)). These reactions have rate constants indicating that the exchange is not of the simple Eigen-Wilkins type. Ternary uranyl sulfate hydroxide species were characterized by their O-17 chemical shift and by potentiometry. There are no separate signals for the possible isomers of the ternary species indicating that they are in fast exchange with each other.
Nyckelord
- uranyl
- sulfate
- O-17-NMR
- EXAFS
- dynamics
- structure
- aqueous-solution
- equilibrium dynamics
- complexes
- nmr
- ion
- kinetics
- exchange
- ligands
- spectra
- raman
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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