M.Sc.

This work represented a contribution to draw attention towards the amount of metals in Basra and Kirkuk crude oil blends. These metals may effect the processing refineries of crud oils.   In chapter one of this thesis, an introduction was given on the crude oil and it^'s origin including both inorganic and organic theories; also the composition and types of crude oil, the importance and the problems associated with the presence of the metals. Finally, the methods used for the determination of metals were given.

         The current study involves the preparation of number of urea derivatives from reaction of urea or thiourea with aromatic amines as in compounds:"Phenylthiourea, N-phenylurea, N-(2-methoxyphenyl) urea, N-(4-aminophenyl) urea, N-(2-methylphenyl) urea, N-(2-methoxyphenyl) thiourea, N-[4- (amino carbonyl) amino phenyl] urea, N-[4-(amino carbonyl) amino phenyl] acetamide, N-pyrazin-2-ylurea, N-pyridin-2-ylurea, N,N^´-bis(3-bromophenyl)urea, N,N^´-bis(2-methoxyphenyl)urea ".In addition to the preparation of three compounds

The work in this thesis include the preparation and characterization of a series of Vanadium (IV) in the term of (VO⁺²) ion, Chromium(III) and Zinc complexes with five  (O,O),(N,N), (O,N) donor ligands, these ligands include:mandilic acid (L₁),0-phenylen di amine (L₂),benzilic acid (L₃),pyruvic acid (L₄) and  N-N' bis(salicylidene)ethylene di amine(L₅),  later was prepared ( L₅) from the reaction of ethylene diamine with salicylaldehyde.The characterization of all the  complexes resulti