Chelates of Poly (8-Hydroxyquinoline-Dimethylolurea)

Abstract

Novel polymeric chelates of a 8-hydroxyquinoline-based polymeric ligand (H2L), namely 8-hydroxyquinoline-dimethylolurea (HQDMU), were prepared with the metal ions Zn(II), Cu(II), Ni(II), Co(II) and Mn(II). The novel 8-hydroxyquinoline-dimethylolurea (HQDMU) polymeric ligand (H2L) was synthesized by condensation of N,N′-dimethylolurea (DMU) with 8-hydroxyquinoline in the presence of a base catalyst. All the polymeric chelates (ML2) and the parent ligand (H2L) were characterized by elemental analyses and IR spectral studies. The number-average molecular weight of the polymeric chelates and polymeric ligand (H2L) was determined by non-aqueous conductometric titration. The thermal stability of polymeric ligand and chelates was investigated by thermogravimetric analysis (TGA). Thermogravimetric parameters such as T0 (initial decomposition temperature), T10 (temperature for 10% weight loss), Tmax. (temperature of maximum rate of degradation), IPDT (integral procedural decomposition temperature) and the activation energy Ea, of the degradation process were calculated. Besides this, diffusion spectral studies of the polymeric chelates were characterized by determining their magnetic susceptibilities.