Polychelates Derived from 4,4′ -(4,4′-Biphenylylene bisazo) di (Resacetophenone)

Abstract Polychelates of Ni(II), Co(II), Zn(II), Cu(II) and Mn(II) were synthesized from bis 4,4′-(4,4′-biphenylylenebisazo) di (resacetophenone) and metal chlorides. All these chelates are dark in colour and insoluble in common organic solvents. Their most probable structures were determined by visible reflectance spectroscopy and magnetic measurements in conjuction with thermogravimetric and IR measurements. Elemental analyses indicate a ligand: metal ratio of 1:1 and association of water molecules with the central metal. The decomposition of temperatures of the polychelates decrease in the following order: Zn(II) > Co(II) > Ni(II) > Mn(II) > Cu(II).