Journal
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
Volume 15, Issue 2, Pages 369-380Publisher
SPRINGER
DOI: 10.1007/s13738-017-1238-2
Keywords
X-ray crystallography; Cobalt Schiff base complexes; Montmorillonite-K10 nanoclay; Electrochemistry
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Funding
- Research Affairs Division Isfahan University of Technology (IUT), Isfahan
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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, (HNMR)-H-1, (CNMR)-C-13 and (PNMR)-P-31. 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-NO(2)Salen)(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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