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Experimental and theoretical structural determination, spectroscopy and electrochemistry of cobalt (III) Schiff base complexes: immobilization of complexes onto Montmorillonite-K10 nanoclay

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Abstract

The [Co(5-XSalen)(PEt3)(H2O)]ClO4 (where Salen = bis(salicylaldehyde)1,2-ethylenediamine and X = H, MeO, NO2, Br) complexes were successfully synthesized and characterized by different techniques such as FT-IR, UV–Vis, 1HNMR, 13CNMR and 31PNMR. The coordination geometry of the [Co(5-BrSalen)(PEt3)(H2O)]ClO4 complex was determined by X-ray crystallography. The complex has six-coordinated pseudo-octahedral geometry in which the O(1), O(2), N(1) and N(2) atoms of the Schiff base form the equatorial plane. The cyclovoltammetry was used to study the electrochemical properties of cobalt complexes, and the results reveal the anodic peak potential becomes more positive in order to MeO < H < Br < NO2. DFT calculations were also done to investigate structures, electronic spectra and infrared spectra of the complexes. The synthesized complexes [Co(Salen)(PEt3)(H2O)]ClO4, [Co(Salen)(PBu3)(H2O)]ClO4 and [Co(5-NO2Salen)(PEt3)(H2O)]ClO4 were incorporated within Montmorillonite-K10 (MMT) nanoclay. Furthermore, structural, thermal and morphological properties of the prepared nanohybrids were verified by FT-IR, XRD, TGA-DTG, EDX, SEM and TEM techniques. XRD results of the new nanohybrid materials elucidate that the Schiff base complexes were placed at the most outerlayer spaces of MMT clay.

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Acknowledgements

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, Sanaz Tavanapour, Kiamars Eskandari & Maryam Bagheri

  2. School of Chemical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia

    Mohammad Hossein Azarian & Wan Ahmad Kamil Mahmood

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  1. Ali Hossein Kianfar
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  2. Sanaz Tavanapour
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Correspondence to Ali Hossein Kianfar.

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Kianfar, A.H., Tavanapour, S., Eskandari, K. et al. Experimental and theoretical structural determination, spectroscopy and electrochemistry of cobalt (III) Schiff base complexes: immobilization of complexes onto Montmorillonite-K10 nanoclay. J IRAN CHEM SOC 15, 369–380 (2018). https://doi.org/10.1007/s13738-017-1238-2

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