Synthesis and Characterization of Nickel(II) Complexes of Benzoic Acid and Methyl Substituted Benzoic Acid Hydrazides and X‐Ray Structure of Ni[C₆H₅CONHNH₂]₃Cl₂·3CH₃OH

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 (μ_eff), 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.

Keywords:

• Nickel
• Hydrazides
• Magnetic
• Infrared
• Electronic
• X‐ray
• Microbiology

Acknowledgment

This work was supported by the University of the North in the form of a Senate Research Grant 1881. An extended leave of absence for OAO from Ladoke Akintola University of Technology, Ogbomoso, Nigeria, is also gratefully acknowledged.