The Synthesis of Four New Schiff Bases and Some of Their Transition Metal Complexes

Isonitrosoacetophenone, synthesized by nitrosotion of acetophenone, has been condensed with diamines (1,4-phenylenediamine, 4,4'-diaminobiphenyl, 4,4'-diaminodiphenylmethane or 4,4'-diaminodiphenylether) to obtain the tetradentate Schiff bases 1,4-phenyliminobis(isonitrosoacetophenone), 1,1'-biphenyl-4,4'-diiminobis(isonitrosoacetophenone), 1,1'-diphenylmethane-4,4'-diiminobis(isonitrosoacetophenone) or 1,1'-diphenyloxy-4,4'-diiminobis(isonitrosoacetophenone). The polymeric Ni(II) and Cu(II) complexes of these Schiff bases are square-planar while the polymeric Co(II) complexes are octahedral with water molecules at the axial positions. The structures of the above complexes were determined by H-1 NMR and IR spectroscopy and elemental analyses.