Spectral and magnetic studies of cobalt(II), nickel(II) and palladium(II) metal with bidentate Schiff base ligands

Department of Chemistry, University of Mumbai, Vidyanagari, Kalina, Santacruz (E), Mumbai-400 098, India E-mail : bipin_281050@yahoo.com Manuscript received 26 June 2009, revised 7 October 2009, accepted 2 February 2010 The divalent metal complexes of cobalt, nickel and palladium have been prepared with bidentate Schiff bases derived by condensing 3-hydroxybenzaldehyde and 5-chlorosalicyladehyde with 4-hydroxybenzhydrazide. The complexes obtained were characterized on the basis of their elemental analysis, magnetic moment, conductance, IR, electronic, 1H NMR as well as thermal analysis. The cobalt and nickel complexes are paramagnetic exhibiting tetrahedral geometry whereas palladium complexes are diamagnetic showing square planar geometry. Their spectral data revealed that both the Schiff bases behave as bidentate ligands and are coordinated to CoII, NiII and PdII via azomethine nitrogen and phenolic oxygen. X-Ray powder diffraction studies suggest orthorhombic crystal system for all the metal complexes