Synthesis and Characterization of Some Co(II), Ni(II) and Cu(II) Mixed Ligand Chelates of 8-Hydroxyquinoline, Anthranilic Acid and o-Aminophenol

Abstract

The series of mixed ligand chelates of Co(II), Ni(II) and Cu(II) ions with some ligands, such as 8-hydroxyquinoline [L₁], anthranilic acid [L₂] and o-aminophenol [L₃] acting as bidentate ligands have been prepared and characterized by various physico-chemical analyses, such as elemental analysis, infrared spectra, molar conductance measurements and electron paramagnetic resonance. Elemental analysis data show the formation of 1 : 1 : 1 [M : L : L´] chelates. The molar conductance measurements of the chelates exhibit the non-electrolytic nature of the chelates. Infrared spectra display that the coordination occurs via oxygen and nitrogen atoms. Electron paramagnetic resonance spectra show the presence of paramagnetic phenomena and supported the geometrical structures of the chelates, that indicate the presence of either square-planar, tetrahedral or octahedral geometries.