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'Xn, 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 and thermal decomposition studies. The ligand coordinates to the metal ions through the oxygen of the carbonyl group and the nitrogen of hydrazine group of the primary ligand (L). The probable geometry for all these complexes, have been assigned based on their physico-chemical data.