名称:
Synthesis, spectral, and biological studies of some metal(II) complexes with benzil salicylaldehyde acyldihydrazones
摘要:
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 d(x2-y2) of the Cu2+ ion. The ligands, as well as their metal complexes, show significant antibacterial activity against Bacillus subtilis and Pseudomonas fluorescens.