Synthesis, Characterization and Thermal Decomposition Studies of Biologically Active Mixed Ligand Complexes Derived from Benzofuran-2-Carboxylic acid (2-Oxo-1,2-dihydro-indol-3-yidene) Hydrazide and Acetylacetone, 1,10-Phenanthroline and 2,2 '-Bipyridyl

Abstract

The mixed ligand complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with benzofuran-2-carboxylic acid (2-oxo-1,2-dihydro-indol-3-ylidene)-hydrazide and acetylacetone(acac), 1,10-phenanthroline(1,10-phen) and 2,2'-bipyridyl(2,2'-bipy) have been prepared. All complexes have the general formula. MLL'X-n, where n = 2, X = Cl and L is the ligand prepared by the reaction of benzofuran-2-carboxy-hydrazide with isatin (indole-2,3-dione) and L' is the secondary ligand such as acetylacetone, 1,10-phenanthroline or 2,2'-bipyridyl. The complexes were characterized on the basis of elemental analysis, spectral, magnetic moment, conductance. X-ray diffraction I and thermal decomposition studies. The ligand coordinates to the metal ions through the oxygen of the carbonyl group and the nitrogen I of hydrazine group of the primary ligand (L). The probable geometry for all these complexes, have been assigned based on their physicochemical data.