الفهرس 
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Abstract
The work in this thesis is divided into two parts linked by an applicable view for the prepared complexes as catalytic oxidants in the presence of co-oxidants. 1-The first part: Several new oxovanadium(IV), cis-dioxovanadium(V), trans-dioxouranium(VI) and cis-dioxomolybdenum(VI) complexes of the three thiosemicarbazone ligands; pyridine-2-carboxaldehyde thiosemicarbazone, pyridine-2-carboxaldehyde-N-(4)-ethylthiosemicarbazone and pyridine-2-carboxaldehyde-N-(4)-phenylthiosemicarbazone, were synthesized and characterized by spectroscopic techniques and investigated by cyclic voltammetry. The use vanadium complexes as catalytic oxidants for the oxidation of primary alcohol to aldehyde and secondary alcohol to ketone is also studied in the presence of hydrogen peroxide (H2O2) or t-butylhyDROPeroxide (t-BuOOH) as co-oxidants. 2- The second part: Preparation of the new complexes, [RuIIX(L4)(PPh3)]X (X = Cl, Br), [VO(L4)(SO4)].2H2O, [MoO2Cl2(L4)] and [MoO(O2)(L4)] (L4 = 1,2-bis(2/-pyridinemethylenimino)benzene, pypdm. derived from 2-pyridinecarboxaldehyde and 1,2 phenylenediamine). These complexes were characterized by spectroscopic techniques and also investigated by cyclic voltammetry. Ruthenium(II) complexes were found to be effective catalyst for the oxidation of primary alcohol to aldehyde and secondary alcohol to ketone in the presence of t-butylhyDROPeroxide (t-BuOOH) or hydrogen peroxide (H2O2) as co-oxidants.