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 nonelectrolyte. 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.