الملخص

This study deals with the preparation and investigation of a number of new complexes of Cu(II) , Zn(II) , Hg(II) , Ag(I) , Pt(IV) and Pb(II).The complexes were formed by the reaction of the mentioned metal ions with the ligand which is derived from oxadiazole, 2–cyclohexy lthio–5–phenyl–1,3,4–oxadiazole (OXC) in the molar ratio (1:1) , (1:2) and (1:3) (metal to ligand ).The prepared complexes having general formulae :   [M(OXC)Cl2]                       [M(OXC)X2]H2O M= Cu(II) , Zn(II)                M= Hg(II) , Pb(II)             X= NO3-, CH3COO-            [M(OXC)2 ]X2                       M = Cu (II), Zn (II), Hg (II), Pb (II)                     X= Cl–, NO3-, CH3COO- [Pt(OXC)3]Cl4                       [Ag(OXC)]NO3 OXC = 2–cyclohexyl thio–5–phenyl–1,3,4–oxadiazole    These complexes have been characterized by variety of chemical, physical and spectroscopic techniques, such as elemental analysis, molar conductance, Infrared absorption spectra, electronic spectra and magnetic susceptibility measurements. These studies indicate that the tetracoordinate complexes have square planer structure and the hexacoordinate complexes have octahedral structure while bidentate complex for Ag(I) have been found to have non-linear (deviated) structure.