Synthesis and structural characterization of Ni(II) complexes containing a heterocyclic NO donor ligand |
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Authors: | PM Vimal KumarPK Radhakrishnan |
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Institution: | School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India |
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Abstract: | Five novel nickel(II) complexes have been successfully synthesized with a heterocyclic ligand, Opdac, Ni(Opdac)2]Cl2 (1), Ni(Opdac)2(CH3OH)2]Br2(CH3OH)2 (2), Ni(Opdac)2]I2 (3), Ni(Opdac)2NO3]NO3 (4) and Ni(Opdac)2ClO4]ClO4 (5) where Opdac = 4-(1-H-1,3-benzimidazole-2-yl)-1,5-dimethyl-2-phenyl-1-2-dihydro-3-H-pyrazol-3-one. All the complexes were characterized by elemental analysis, molar conductivity, CHN analysis, magnetic susceptibility measurements, spectroscopic studies and TG/DTA methods. In all the complexes, Opdac acts as a bidentate ligand coordinating to Ni(II) ion via the benzimidazole imine nitrogen and the pyrazolone oxygen atoms. The complexes 1 and 3 have a tetrahedral geometry while 2, 4 and 5 have an octahedral geometry around the Ni(II) center. |
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Keywords: | Ni(II) complexes Schiff base Spectra Magnetism Crystal structure |
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