X-ray absorption spectroscopic studies on model compounds for biological iodine and bromine

MC Feiters, Frithjof Küpper, W Meyer-Klaucke

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

X-ray absorption spectra of a number of organic iodine and bromine compounds of biological relevance, as well as of a series of iodine compounds with different oxidation states, have been measured. The iodine K-edge spectra (XANES) are found to be relatively featureless but the position of the edge is found to be sensitive to formal valence ( among other factors), and the edge shape to the number of bound O atoms. EXAFS spectra of organohalogen compounds ( both iodine and bromine) can be used to discriminate between aliphatic and aromatic compounds. There are differences both in the distances from the halogens to the first shell of C atoms, which are shorter for aromatic compounds, and in the patterns of shells in the Fourier transforms. This result is expected to be relevant to studies at these edges in biological systems.
Original languageEnglish
Pages (from-to)85-93
Number of pages9
JournalJ SYNCHROTRON RADIAT
Issue number2
DOIs
Publication statusPublished - 2005

Keywords

  • EXAFS CALCULATIONS
  • Optics
  • COMPLEX
  • CURVED-WAVE THEORY
  • MOLECULAR-DYNAMICS
  • Instruments & Instrumentation
  • Physics, Applied
  • ASCOPHYLLUM-NODOSUM
  • SOLVENTS
  • FINE-STRUCTURE
  • AQUEOUS-SOLUTIONS
  • K-EDGE
  • DEPENDENT HALOPEROXIDASES

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