Preparation and Study the Complexes of Nickel (II) and Copper (II) with Octadentate Schiff Base

The reaction between 3,3-,4,4- tetra amino bi phenyl and o-hydroxy Benzaldehyde in 1:4 molar ratio affords a novel tetrabasic octadentate Schiff base. its reaction with Ni (O Ac)2 or Cu(O Ac)2 in 1:2 molar ratio. Leads to the formation of dinuclear complexes of the general formula (Ni2L) and the latter. reacts with the metal halide MX2 (M=, Ni, Cu, X=Cl or Br ) in 1:2 molar ratio to form tetranuclear complexes of the general formula ( M2LM2X4). The coordination of the Schiff base in the dinuclear complexes seems to occur via N- azomethine followed by deprotonation of the OH groups, while the further coordination in the tetranuclear complexes seems to take place via the lone pair of electrons available on the oxygen atoms. The structural features of the chelates have been confirmed by elemental analysis, IR, UV vis and magnetic measurement .The compounds have been prepared in lab Temperature. (author)