Transition metal M(II) complexes with isonicotinoylhydrazone-9-anthraldehyde

New complexes of isonicotinic acid 2-(9-anthrylmethylene)-hydrazi- de with Cu(II), Co(II) and Ni(II) have been prepared and characterized by ana- lytical and physico-chemical techniques, such as elemental and thermal ana- lyses, magnetic susceptibility and conductivity measurements, and electronic, EPR and IR spectral studies. The infrared spectral studies revealed the bidentate or monodentate nature of the Schiff base in the complexes; the pyridine nitrogen does not participate in the coordination. A tetrahedral geometry is suggested for the nitrate complexes and an octahedral geometry for the others. Thermal studies support the chemical formulation of these complexes.