Synthèse chimique et propriétés spectroscopiques de complexes de métaux de transition symétriques et asymétriques. Réactivité électrochimique en milieu organique en présence du dioxygène : approche biomimétique

Abstract

Transition metal complexes of tetradentate Schiff base ligands were synthesized and bcharacterized by different spectral methods such as IR, UV-Vis, 1H and 13C NMR, Dept 135, Cosy, SM, ATG/DTG and microanalysis. The molecular structures of crystals obtained for some compounds were also determined by single crystal X-ray diffraction technique. Electrochemical properties of the complex were investigated, in DMF, by cyclic voltammetry (CV) using glassy carbon as working electrode under nitrogen. The diffusion coefficients of the complexes were investigated on GC rotating disk electrode (RDE) voltammetry using the Levich plot, Ilim = f(ω1/2). Theoretical calculations using the density functional theory (DFT) method were performed to compare the results obtained with the experimental data. The complexes are exploited in the catalytic oxidation of cyclohexene in the presence of hydrogen peroxide