Journal
POLYHEDRON
Volume 81, Issue -, Pages 90-97Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2014.05.049
Keywords
Cobalt(III) complexes; N2O2 Schiff base ligand; Crystal structure; Cyclic voltammetry; Antibacterial activity
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Funding
- Isfahan University of Technology Research Council
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The synthesis and characterization of a series of cobalt(III) complexes of the general type trans-[Co(Mesalen)(L-2)]X, are described. The H2Me-salen = N,N'-bis(methylsalicylidene)-1,2-ethylenediimine) and the two ancillary ligands (L) in the trans positions are: benzylamine (bzlan) 1, 1-methylimidazole (1-MeIm) 2, morpholine (mrpln) 3, pyrolidine (prldn) 4, 3-methylpyridine (3-Mepy) 5, 4-methylpyridine (4-Mepy) 6, pyridine (py) 7. These complexes have been characterized by elemental analyses, IR, UV-Vis, and H-1 NMR spectroscopy. The crystal structures of trans-[Co-III(Me-salen)(bzlan)(2)]PF6, 1, and trans-[Co-III(Me-salen)(3-MepY)(2)]PF6, 5, have been determined by X-ray diffraction on solvated crystals. While the Co(Me-salen) unit in I adopts a stepped non-planar conformation, an umbrella conformation is assumed by the Co(Me-salen) unit in complex 5. The electrochemical reduction of these complexes at a glassy carbon electrode in acetonitrile solution indicates that the first reduction potential of Co(III/II) is irreversible, with the concomitant release of the axial ligands. Our studies showed that the metal complexes exhibit moderate antibacterial activity, and their antibacterial activity is higher than that of the ligand against both Gram positive and Gram negative bacteria. (C) 2014 Elsevier Ltd. All rights reserved.
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