Title of article :
Synthesis, spectroscopy, electrochemistry and structural determination of asymmetric cobalt(III) Schiff base complexes
Author/Authors :
Kianfar, Ali Hossein Department of Chemistry - Isfahan University of Technology , Sedighipoor, Maryam Department of Chemistry - Isfahan University of Technology , Mohammadnezhad, Gholamhossein Department of Chemistry - Isfahan University of Technology , Gorls, Helmar Institut für Anorganische und Analytische Chemie - Lehrstuhl für Anorganische Chemie II - Friedrich-Schiller-Universität Jena , Plass, Winfried Institut für Anorganische und Analytische Chemie - Lehrstuhl für Anorganische Chemie II - Friedrich-Schiller-Universität Jena , Roushani, Mahmoud Department of Chemistry - Ilam University
Abstract :
The [CoL(PR3)(CH3OH)]ClO4 (where L = MeSalophen, 5-NO2MeSalophen, 5-BrMeSalophen, 5-MeOMeSalophen, 4-MeOMeSalophen, 3-MeOMeSalophen and R=Ph or Bu) complexes were synthesized and also characterized by FTIR, UV–Vis, 1H NMR and 13C NMR spectroscopies. The absorptions between 550 and 750 nm for the complexes are attributed to d–d transitions. Electrochemical properties of the complexes were examined by means of cyclic voltammetry. The anodic peak potentials were more positive in the following trend NO2 > Br > H > MeO and are in accordance with electronic effects of the substituents. The crystal structure of [Co(5-NO2MeSalophen)(PBu3)(CH3OH)]ClO4 and [Co(5-BrMeSalophen)(PPh3)(CH3OH)]ClO4 was determined by single-crystal X-ray diffraction. They showed six-coordinated pseudo-octahedral geometries in which equatorial planes are formed by the O(1), O(2), N(1) and N(2) atoms of the Schiff base and the axial positions were occupied by PR3 and methanol.
Keywords :
X-ray crystallography , Asymmetry , cobalt Schiff base complexes , Electrochemistry
Journal title :
Astroparticle Physics
