Chelates of Poly(8-Hydroxyquinoline-Dimethylolurea)

摘要

Novel polymeric chelates of a 8-hydroxyquinoline-based polymeric ligand(H_2L),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-hydroxyquino-line-dimethylolurea(HQDMU)polymeric ligand(H_2L)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(M_n)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 T_0(initial decomposition temperature),T_(10)(temperature for 10% weight loss),T_(max)(temperature of maximum rate of degradation),IPDT(integral procedural decomposition temperature)and the activation energy E_a,of the degradation process were calculated.Besides this,diffusion spectral studies of the polymeric chelates were characterized by determining their magnetic susceptibilities.