S K- and Mo L-edge X-ray absorption spectroscopy to determine metal-ligand charge distribution in molybdenum-sulfur compounds

Annette Rompel, Roehl M. Cinco, John H. Robblee, Matthew J. Latimer, Karen L. McFarlane, Jiong Huang, Marc A. Walters, Vittal K. Yachandra

Research output: Contribution to journalArticlepeer-review

Abstract

Mo L-edge and S K-edge X-ray absorption spectroscopy were applied to investigate the charge distribution between Mo and S in a series of Mo thiolate compounds, which serve as amide-sulfur H-bonding models and exhibit different redox potentials arising from polar group effects and ligand hydrogen bonds near the redox center. For all oxidized complexes, the S K-edge spectra exhibit a thiolate-based pre-edge feature centered at 2470.2 eV and the inflection point occurs at 2472.0 eV. No intense pre-edge feature is observed in the spectra for the reduced Mo model compounds and the energy shift of the S K-edge position depends on the S-ligand. Correlations between ligand charge density and the redox potential of the Mo-S cores are observed.

Original languageEnglish (US)
Pages (from-to)1006-1008
Number of pages3
JournalJournal of Synchrotron Radiation
Volume8
Issue number2
DOIs
StatePublished - Mar 1 2001

Keywords

  • Hydrogen bonding
  • Pre-edge
  • Redox potential
  • S K-edge
  • XAS

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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