Synthesis and characterization of poly(piperazinyl phosphorimine) and its metal complexes in aqueous medium

Abstract

Poly( piperazinyl phosphorimine) was prepared by Schotten-Boumann method using phosphorus oxychloride and piperazine at room temperature. Polymer metal complexes were prepared in aqueous solutions using divalent metal salts <i>viz. </i>Cu(II), Ni(II), Mg(II), Ca(II) and Cd(II) with the polymer. Spectral evidences confirmed the formation or the metal complexes. Thermogravimetric analysis and differential scanning calorimetry were employed to investigate the thermal stability or the polymer and its metal complexes. The IR spectroscopy of the polymer and complexes suggests that metals could be co-ordinated through oxygen of the phosphorimine group and tertiary nitrogen atom. The DRS, EPR and magnetic moments confirmed the complex formation and showed the geometry or the complexes. Small angle XRD pattern shows that the polymer was amorphous, whereas the complexes were crystalline. Energy dispersive X- ray crystallographic studies confirmed the metal incorporation in the polymer chain.