Synthesis and spectral studies of manganese(II), cobalt(ll), nickel(II), copper(II), zinc(II), cadmium(ll) and mercury(II) complexes of 4-oxo-4H-1-benzopyran- 3-carboxaldehyde hydrazone derivatives

Abstract

A few complexes of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) with 4-oxo-4H-1 benzopyran- 3-(carboxaldehyde-4-chlorobenzylhydrazone) (BCBH) and 4-oxo-4H-1-benzopyran- 3- (carboxaldehyde-4-methylbenzylhydrazone) (BMBH) have been synthesised and characterized by elemental analysis, molar conductivities, magnetic measurements and IR and visible spectral studies. The IR spectra show that BCBH and BMBH behave as bidentate ligands either in the keto or enol form.