Synthesis and Chracterization of 1,3,4- oxadiazole derivatives with some new transition metal complexes


A new ligands N-[(1E)-(2-bromo phenyl)methylene]-5-hydrazino-1,3,4-oxadiazol-2-amine (L1) and ethanedial{5-[(2-bromobenzylidene)amino]-1,3,4-oxadiazol-2-yl}hydrazone (L2)and its Co(II), Ni(II)and Cu(II) complexes were synthesized. The authenticity of the ligands (L1,L2). This complexes were established by elemental analysis, conductance and magnetic susceptibility measurements, as well as spectroscopic (FTIR, mass, uv-visible,). The FTIR and mass spectra were corresponding as it is expected. The (L1) acts as a bidentate ligand coordinating through the oxygen atom of the oxadiazole ring and the nitrogen atom of amino group. This view is further supported by the appearance of a band corresponding to the metal-nitrogen and metal-oxygen stretching vibration at 454–688 cm–1 and 314-466 cm-1 in the complexes respectively. The (L2) acts as a tridentate ligand coordinating through the two oxygen atosms of the oxadiazole ring and [C=O]gruop and the nitrogen atom of shiff base [C=N]. The magnetic studies suggest an tetrahedral and octahedral geometry of the complexes .The complex of Co(III) for the (L1) have shown octahedral geometry,the complex of Cu(II) has shown tetrahedral geometry with (L1). The complexes of [Ni(II), Cu(II)] for the (L2) have shown tetrahedral geometry.