College of Science

          Four tetradentate ligands were prepared by reacting salicylaldehyde with different aromatic diamines in acidic medium (Schiff-base reaction). F.T.IR, ¹H-NMR and Maldi- MS techniques were employed to identify the L₁ (1,4-bis(N-o-hydroxybenzylidine)phenylene diamine)and L₂ (4,4-bis(o-hydroxybenzylidene)biphenyl- amine) molecules, while only F.T.IR and ¹H-NMR spectra were used in the identification of L₃ (4,4-bis(o-hydroxybenzylidene)methylene-dianiline)molecules.

          Three new ligands have been prepared in this work, which were chosen to synthesis a new set of transition metal complexes [Cu (II), Ni (II), Hg (II), Cd (II) and Co (II)]  LI=(2-[5-phenyl-2-methylthio-1,3,4-oxadizole]-5-phenyl-1,3,4-oxadiazole), LII=2-(O-chloro benzylidine) hydrazine benzothiazole and LIII=2-(p-hydroxy benzylidine) hydrazine benzothiazole were prepared by Schiff reaction between 2-mercaptobenzothiazole and 2-chlorobenzaldehyde and p-hydroxy  benzaldehyde.The new ligands were characterized by the Infra-red spectrosco

1,3,4-Oxadiazole derivatives were prepared which have a number of therapeutic applications, and in a purpose of investigating the coordination behavior of new compounds towards transition metal ion, these compounds are prepared by oxidation of 5-aryl-1,3,4-oxadiazole-3-thiol using hydrogen peroxide forming bis(5-aryl-1,3,4-oxadiazole-2-yl) disulfide.The 1,3,4-oxadiazole compounds (L_I, L_II and L_III) have been used as ligands to prepared a number of transition metal complexes, which include [Fe(III), Co(II), Cu(II) and Mn(II)] ions.The ligands were characteriz