Synthesis and Characterization of 1,2-bis[4-(pent-3-en-4yl-2-one)ethane], a Novel QuardidentateLigand and its TransitionMetal Complexes

A novel crystalline enaminoketone ligand was synthesized by reacting 1, 2-di (4-aminophenyloxy) ethylene with acetyl acetone. After that it was complexed with different metal acetates to prepare chromium Cr (II), cobalt Co (II), copper Cu (II) and zinc Zn (II) complexes. Elemental analysis, magnetic susceptibility measurements, thermogravimetric analysis, x-rays crystallographic studies, UV-visible spectroscopy were carried out for structural elucidation and property exploration. The ligand exhibited quardidentate structure with two N-donor and two O-donor atoms with central methylene bridge in the gauche conformation which was stabilized by two intramolecular N-H--O hydrogen bonds The dihedral angle between the two aromatic rings was 45.1 degrees. All complexes were thermally stable and exhibit square planar or tetrahedral geometries.