Journal of the Serbian Chemical Society 2012 Volume 77, Issue 5, Pages: 627-637
https://doi.org/10.2298/JSC110412148S
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Physico-chemical and biological studies of Cu(II), Co(II) and Ni(II) complexes of an N4 coordinating ligand derived from diacetylbisethylenediamine and benzoic acid
Singh Pal Netra (Department of Chemistry, Meerut College, Meerut, India)
Srivastava Nanda Abhay (Department of Chemistry, Meerut College, Meerut, India)
Mononuclear metal complexes of the type [ML1]Cl2 (where, M = = Cu(II), Co(II)
or Ni(II) and L1 = ligand) were synthesized by the reaction of a new N4
coordinating ligand, derived from diacetylbisethylenediamine with benzoic
acid, and the corresponding hydrated metal chloride salts. The metal
complexes were characterized by elemental analysis, melting point
determination, molar conductance and magnetic moment measurements, IR,
UV-Vis, 1H- and 13C-NMR, and ESR spectroscopy. The ligand and all the metal
complexes were stable in the solid state at room temperature. From the
analytical and spectroscopic investigations, the stoichiometry of the
complexes was found to be 1:1 (metal:ligand). Based on the electronic
spectra and magnetic moment data, the metal complexes had a square planar
geometry. The molar conductance values show the 1:2 electrolytic nature of
the metal complexes. A cyclic voltammetric study of the Cu(II) metal complex
has also performed, which showed one electron quasi-reversible reduction
around -0.92 to -1.10 V. In vitro biological activities of the ligand and
metal complexes was checked against two bacteria Bacillus subtilis and
Escherichia coli and two fungi Aspirgillus niger and A. flavus which showed
the antibacterial and antifungal properties of the ligand and its metal
complexes.
Keywords: mononuclear Cu(II), Co(II) and Ni(II) complexes, diacetylbisethylenediamine, antibacterial and antifungal properties