| Numéro |
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-637 - C2-638 | |
| DOI | https://doi.org/10.1051/jp4/1997125 | |
J. Phys. IV France 7 (1997) C2-637-C2-638
DOI: 10.1051/jp4/1997125
Differentiating Between Monodentate and Bidentate Carboxylate Ligands Coordinated to Uranyl Ions Using EXAFS
M.A. Denecke1, T. Reich1, S. Pompe1, M. Bubner1, K. H. Heise1, H. Nitsche1, P. G. Allen2, J. J. Bucher2, N. M. Edelstein2 and D. K. Shun21 Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, Germany
2 Lawrence Berkeley National Laboratory, Chemical Sciences Division, MS 70A-1150, Berkeley, CA 94720, U.S.A.
Abstract
We have investigated the U LIII-edge EXAFS of two carboxylato uranyl complexes of known structure to explore the possibilty of
differentiating between monodentate and bidentate coordinated carboxylate ions. The interpretation of EXAFS results from uranyl complexes
with carboxylate ions based solely on axial and equatorial bond lengths can be inconclusive; information from further-distant shells is often
needed. Multiple scattering (MS) pathways along the O=U=O unit and in coordinating chelating or monodentate carboxylate groups can make
substantial contributions to the EXAFS. Therefore, MS pathways were calculated using FEFF6 [1] and considered in the data analysis. EXAFS
results are compared to XRD data reported in the literature.
© EDP Sciences 1997