Abstract

The potential of high energy XANES (X-ray absorption near edge structure) as a tool for the structural analysis of lanthanoid-containing systems has been explored. The K-edge XANES spectra of La³⁺, Gd³⁺, and Lu³⁺ ions both in DMSO solution and solid octakis-(DMSO)lanthanoid(III) iodides have been analysed. Although the K-edges of lanthanoids cover the energy range of 38 (La) to 65 (Lu) keV, the large widths of the core hole states do not appreciably reduce the potential structural information of the XANES data. We show that, for lanthanoid compounds, accurate structural parameters are obtained from the analysis of K-edge XANES signals if a deconvolution procedure is carried out. We found that in solid octakis(DMSO)lanthanoid(III) iodides the Ln³⁺ ions are coordinated by eight DMSO ligands arranged in a quite symmetric fashion. In DMSO solution the Ln³⁺ ions retain a regular eight-coordination structure and the coordination number does not change along the series. In contrast to when in water the second coordination shell has been found to provide a negligible contribution to the XANES spectra of Ln³⁺ ions in DMSO solution.

Published in

Physical Chemistry Chemical Physics
2013, Volume: 15, number: 22, pages: 8684-8691

SLU Authors

• Persson, Ingmar

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Inorganic Chemistry


Publication identifier

DOI: https://doi.org/10.1039/c3cp50842k

Permanent link to this page (URI)

https://res.slu.se/id/publ/43024