Synthesis and Characterization of Dioxygen Complexes of Molybdenum (VI),Tungsten (VI), Zinc (II) and Cadmium (II) With Some Monodentate and Multidentate Ligands

M. T. H. Tarafder and Lee W. Fong

Department of Chemistry, University Putra Malaysia, 43400 UPM Serdang, Selangor Malaysia.

Several novel organodioxygen complexes, [M(O)(O2)2 L] [M=Mo(VI)] and [M'(O2)L] [M'=Cd(II) and Zn(II) and Zn (II)] have been synthesized containing monodentate, bidentate and tridentate ligands. [L=pyridine ,picolinic acid, diethylenetriamine, 1, 2-phenylenediamine, triphenylphosphine oxide]. These complexes were characterized by elemental analyses conductivity measurements, infrared, Raman spectral studies. The v (O=O) stretches of the superaxo complexes were only Raman active, because of apparent linearity of the M-O2 moieties, giving peaks at 1020-1030 cm-1. The complexes were all thermodynamically stable and the complexes containing didentate ligands were found to undergo oxygen transfer reactions to various organic and inorganic substrates. Mechanism have been postulated.

Organodioxygen; Monodentate; Diethylenetriamine; triphenylphosphine