SYNTHESIS AND CHARACTERIZATION OF TRANSITION METAL COMPLEXES OF N’-[(2Z, 3E)-3-(HYDROXYIMINO) BUTAN-2-YLIDENE] BENZOHYDRAZIDE

Synthesis and characterization of Co(II), Ni(II), Cu(II) and Pd(II) complexes of ligand N‘-[(2Z,3E)-3-(hydroxyimino) butan-2-ylidene] benzohydrazide are reported. The ligand is monobasic and bidentate in nature. The molar conductivities reveal that all the metal complexes are non-electrolyte. The metal complexes have been characterized on the basis of spectral and magnetic studies. Co(II) ion forms brown complex Co(BBH)₂ which has low spin square planar geometry. The diamagnetic nature and the spectral features of the brown Ni(BBH)₂ complex suggests the square planar environment for the Ni(II) ion. Ni(BBH)₂ adds on two molecules of pyridine to form a high spin six coordinate adduct. The room temperature magnetic susceptibility measurements of the pyridine adduct of Ni(BBH)₂ indicates octahedral nature of the complex which is further supported by the absorption spectrum. The magnetic data in case of Cu(BBH)₂ indicates presence of one unpaired electron in Cu(II) ion. The EPR spectrum of Cu(BBH)₂ suggests the square planar geometry which is further supported by electronic absorption spectrum of the complex. Studies reveal square planar geometry for Pd(BBH)₂ complex.