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 spectroscopy and melting points. The metal complexes, were prepared and isolated in pure solid state, and found to be stable toward light, heat and moisture. These new complexes were characterized via FT.IR , UV-Vis Spectroscopy, magnetic and conductivity measurements. In addition the metal contain were determind by atomic absorption measurement. Different bonding and structural behavior were revealed through the study of the coordination chemistry of the metal complexes of the new ligands.