title: Using low-frequency IR spectra for the unambiguous identification of metal ion-ligand coordination sites in purpose-built complexes.
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.
authors: Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary.
authors: Gábor
authors: G
authors: Varga
authors: Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary.
authors: Zita
authors: Z
authors: Csendes
authors: Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. tér 1, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary.
authors: Gábor
authors: G
authors: Peintler
authors: Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. tér 1, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary.
authors: Ottó
authors: O
authors: Berkesi
authors: Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary.
authors: Pál
authors: P
authors: Sipos
authors: Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, Hungary; Materials and Solution Structure Research Group, University of Szeged, Hungary. Electronic address: palinko@chem.u-szeged.hu.
authors: István
authors: I
authors: Pálinkó
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D003545:Cysteine / Q000737:chemistry; D006639:Histidine / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry; D007477:Ions; D008024:Ligands; D008314:Malonates / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D011437:Propylamines / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D056831:Coordination Complexes; D007093:Imidazoles; D007477:Ions; D008024:Ligands; D008314:Malonates; D008670:Metals; D011437:Propylamines; D006639:Histidine; C029899:imidazole; C030290:malonic acid; D003545:Cysteine; C035263:2-propylamine
keywords: Biomimetic complexes; Low-frequency infrared spectroscopy; Metal–ligand vibrations; Probe complexes