Characterization Studies of Some Bi- and Tetradentate Bifunctional Schiff Base Complexes with Co(II), Ni(II), and Cu(II)

Article abstract of DOI:10.1007/BF00798452

Co(II), Ni(II) and Cu(II) complexes of some bifunctional arylidene-o-phenylenediamine Schiff bases have been prepared.Formation, stoichiometry and stability of the complexes have been tested in solution using electronic spectral measurements.Characterization of the complexes has been accomplished primarily by elemental analysis, molar conductance as well as electronic and IR spectral measurements.It is concluded that the o,o-hydroxy derivative (L₁) acts as a bivalent ONNO tetradentate ligand while the molecules of the other derivatives (L₂-L₅) are coordinated to the metal ions as bidentate NN ligands.The Cu(II)-L₁ complex is suggested to possess a tetrahedral geometry whereas the other complexes are suggested to exhibit a distarted octahedral geometry.The different bands observed in the electronic spectra of the complexes in DMF solutions have been assigned to the ?-?*, L ---> M CT and d-d electronic transitions.Keywords: Complex formation constant; Conductance