Using low-frequency IR spectra for the unambiguous identification of metal ion-ligand coordination sites in purpose-built complexes

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Abstract

One of the aims of our long-term research is the identification of metal ion-ligand coordination sites in bioinspired metal ion-C- or N-protected amino acid (histidine, tyrosine, cysteine or cystine) complexes immobilised on the surface of chloropropylated silica gel or Merrifield resin. In an attempt to reach this goal, structurally related, but much simpler complexes have been prepared and their metal ion-ligand vibrations were determined from their low-frequency IR spectra. The central ions were Mn(II), Co(II), Ni(II) or Cu(II) and the ligands (imidazole, isopropylamine, monosodium malonate) were chosen to possess only one-type of potential donor group. The low-frequency IR spectra were taken of the complexes for each ion-ligand combination and the typical metal ion-functional group vibration bands were selected and identified. The usefulness of the obtained assignments is demonstrated on exemplary immobilised metal ion-protected amino acid complexes.

Original languageEnglish
Pages (from-to)257-259
Number of pages3
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume122
DOIs
Publication statusPublished - Mar 25 2014

Keywords

  • Biomimetic complexes
  • Low-frequency infrared spectroscopy
  • Metal-ligand vibrations
  • Probe complexes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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