230968-70-4Relevant academic research and scientific papers
Synthesis, characterization and electrochemical behaviour of some manganese and copper complexes with tetradentate Schiff base ligands
Tidjani-Rahmouni,Djebbar-Sid,Chenah,Benali-Baitich
, p. 979 - 994 (1999)
A series of symmetrical tetradentate Schiff bases derived from substituted salicylaldehyde and ethylenediamine were prepared and characterized by elemental analysis, IR, UV-Visible and 1H NMR spectroscopy. The interaction of these bases with MnCl2 4H2O and CuCl2.4H2O have been studied, leading to the preparation of manganese(II) and copper(II) complexes Microanalysis, molar conductance, IR, UV-Visible spectroscopy, magnetic measurements and ESR spectra have been used to elucidate the stucture of the resultant complexes The experimental data show that all the Schiff base ligands N,N′-bis(2-hydroxybenzyl)ethylenediimine (H2L1), N,N′-bis(2-hydroxyacetophenyl)ethylenediimine (H2L2) and N,N′-bis(2-hydroxypropiophenyl)ethylenediimine (H2L3) yield 1:1 compounds except for the ligand H2L2 which gave a 2:1 compound with manganese(II). The spectral studies support the binding of the ligands with two N and two O donor sites to the metal(II) ion, giving an arrangement of N2O2 donor groups Magnetic and ESR data indicate that the manganese(II) adopts a high spin configuration in the complexes studied and the covalent character of the metal-ligand bonding in the copper(II) complexes increases with the increasing electron donating effect of the ligand substituents R The electrochemical behaviour of the manganese(II) and the copper(II) complexes was determined by cyclic voltammetry which shows that the chelate structure and electron donating effects of the ligand substituents are among the factors influencing the redox potentials of the complexes.
