Ion/Molekülreaktionen negativ geladener KomplexeSchiffscher Basen mit potentiellen Ligandmolekülen in der Gasphase

摘要

Ion/molecule reactions of four coordinateSchiffbase complexes under negative ion chemical ionization conditions have been studied. The complex metal ions consisted of cobalt(II), nickel(II) and copper(II).Schiffbase ligands with different donor strengths were employed. The gas mixtures used contained 90 methane and 10 of the gases O2, NO or CO. The spectra showed intense molecular negative ions, formed by secondary electron capture processes. Secondary ions were formed via ion/molecule reactions between the parent molecular negative ion and added gas molecules to giveMLX−,X=O2, NO, CO;L=Schiffbase ligand,M=Co(II) or Ni(II). Consistent with former investigations, secondary ion formation was not found for the copper compounds. Influence of the central metal ion as well as the ligand donor strength on the ion/molecule reactions are discussed. From the results obtained a mechanism of the secondary ion formation is suggeste