Synthesis, spectral, and biological studies of some metal(II) complexes with benzil salicylaldehyde acyldihydrazones |
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Authors: | V P Singh P Gupta N Lal |
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Institution: | (1) Chemistry Department, Faculty of Science Banaras Hindu University, Varanasi, 221005, India;(2) Institute of Life Sciences, Chhatrapati Shahu Ji Maharaj University, Kanpur, 208024, India |
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Abstract: | Complexes of the general formula M(Bsodh)]Cl and M(Bsmdh)]Cl, where M = Co(II), Ni(II), Cu(II), Zn(II,) and Cd(II) (HBsodh
= benzil salicylaldehyde oxalic acid dihydrazone and HBsmdh = benzil salicylaldehyde malonic acid dihydrazone) were synthesized
and characterized by elemental analyses, molar conductance, magnetic moments, electronic, ESR, infrared spectra, and X-ray
diffraction studies. The complexes are stable solids insoluble in common organic solvents and 1: 1 electrolytes. The magnetic
moments and electronic spectra reveal a square-planar geometry for M(Bsodh)]Cl and a six-coordinate octahedral geometry for
M(Bsmdh)]Cl. The HBsodh ligand bonds to the metal ion via one >C=O, two >C=N−, and one deprotonated phenolate group, whereas
HBsmdh bonds through three >C=O, two >C=N−, and one phenolate group. The lattice parameters for Co(Bsodh)]Cl and Ni(Bsmdh)]Cl
correspond to tetragonal and orthorhombic crystal lattices, respectively. ESR spectral data indicate the presence of an unpaired
electron in of the Cu2+ ion. The ligands, as well as their metal complexes, show significant antibacterial activity against Bacillus subtilis and Pseudomonas fluorescens.
The text was submitted by the authors in English. |
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