Electrochemical studies of manganese(II) complexes containing pentadentate ligands with O2N3, O3N2, and O2SN2 donor sets

Article abstract of DOI:10.1021/ic50217a012

Manganese(II) complexes of linear, potentially pentadentate ligands with donor sets of O₂N₃, O₃N₂, and O₂SN₂ derived from substituted aldehydes and polyamines have been synthesized. Characterization via elemental analysis, infrared spectra, and magnetic susceptibility has been accomplished. Differences in reactivity with dioxygen and nitric oxide both in solution and in the solid state suggest that some subtle effects exist between complexes. Dioxygen reactivity leads to initial oxidation of manganese(II) followed by irreversible oxidation of the coordinated ligand. Reaction with nitric oxide produces manganese(I) nitrosyls. Cyclic voltammetry has been performed on the manganese(II) precursors in dimethyl sulfoxide. A donor atom as well as aromatic ring substituent effect was noted for each quasi-reversible redox couple. Complexes with C₂H₄ units between potential donor groups exhibited additional electrochemical activity, some of which was sweep-rate dependent.