Spectroscopic and antimicrobial studies of La, Pr, Nd and Gd complexes of a dipodal [N,N,N] chelating ligand |
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Authors: | Zafar A Siddiqi M Shahid Mohd Khalid Shabana Noor S Kumar |
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Institution: | aCoordination Chemistry Research Group, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India |
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Abstract: | The lanthanide complexes of bis(benzimidazole-2′-yl-methyl)amine (BImz) having molecular formula M(BImz)X3H2O]·nH2O (M = La, Pr, Nd, or Gd; X = Cl or ClO4 and n = 1, 2 or 3) were prepared and characterized spectroscopically through IR, 1H and 13C NMR, FAB-mass, UV–visible and luminescence spectroscopy. TGA data suggested presence of coordinated and the lattice water. The oscillator strengths of the f–f transitions and the covalency parameters (β, b1/2 and δ) have been evaluated from the electronic spectral data. The proposed hepta-coordinate geometry for the complexes has been ascertained from the molecular model computations. CV studies indicate formation of a stable quasi-reversible redox couple GdIII/IV in the solution. The in vivo antimicrobial activities of the complexes have been evaluated against gram +ve and gram −ve bacteria and fungi. |
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Keywords: | Dipodal tridentate ligand Lanthanide salts Molecular model computations TGA Covalency parameters Antimicrobial activities |
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