Abstract
Nickel(II) complexes of benzoic acid hydrazides (BAH) and o, m, and p‐substituted methylbenzoic acid hydrazides (MBAH) have been prepared and characterized by elemental analysis, room temperature magnetic susceptibility measurements, infrared and electronic reflectance spectral studies. The biological activities of the compounds and x‐ray structure of Ni[C6H5CONHNH2]3Cl2·3CH3OH are also reported. The microanalyses showed that the hydrazides reacted with the nickel(II) salts in 1:3 (metal:ligand) molar ratio. The hydrazide ligand behaves as a neutral bidentate chelating ligand with coordination involving the carbonyl oxygen and the amino nitrogen of the hydrazide moiety. The effective magnetic moments (μeff), infrared and electronic spectra of the compounds are consistent with a six‐coordinate pseudo‐octahedral arrangement of the ligands around the nickel ion. The x‐ray diffraction analysis of Ni[C6H5CONHNH2]3Cl2·3CH3OH showed that it crystallizes as a triclinic system with a P‐1 space group, a=10.2289(5), b=12.0707(6), c=14.0477(7) Å, α=67.5540(10)°, β=69.2360(10)°, γ=73.7860(10)°. The nickel ion is coordinated by three units of benzoic acid hydrazide with the chloride ions and the methanol solvates uncoordinated in the crystal lattice. The compounds show some measurable activity against selected bacteria and fungi.
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