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Synthesis, spectroscopy, electrochemistry and structural determination of asymmetric cobalt(III) Schiff base complexes

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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.

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Acknowledgments

We wish to express our gratitude to the Research Affairs Division Isfahan University of Technology (IUT), Isfahan, for partial financial support.

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Authors and Affiliations

  1. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Ali Hossein Kianfar, Maryam Sedighipoor & Gholamhossein Mohammadnezhad

  2. Institut für Anorganische und Analytische Chemie, Lehrstuhl für Anorganische Chemie II, Friedrich-Schiller-Universität Jena, Humboldtstr. 8, 07743, Jena, Germany

    Helmar Görls & Winfried Plass

  3. Department of Chemistry, Ilam University, Ilam, Iran

    Mahmoud Roushani

Authors
  1. Ali Hossein Kianfar
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  2. Maryam Sedighipoor
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  3. Gholamhossein Mohammadnezhad
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Correspondence to Ali Hossein Kianfar.

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Kianfar, A.H., Sedighipoor, M., Mohammadnezhad, G. et al. Synthesis, spectroscopy, electrochemistry and structural determination of asymmetric cobalt(III) Schiff base complexes. J IRAN CHEM SOC 14, 313–322 (2017). https://doi.org/10.1007/s13738-016-0979-7

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  • DOI: https://doi.org/10.1007/s13738-016-0979-7

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