A new chelating copolymer (HQDMA) has been synthesized through copolymerization of 8-hydroxyquinoline and dimethylolacetone
monomers in the presence of base as a catalyst. This newly developed copolymer ligand (H2L) has been used to prepare a series of five polymeric chelates (ML) by using Zn(II), Cu(II), Ni(II), Co(II) and Mn(II) metal
ions. Both the parent ligand and its metal chelates have been systemically investigated in detail to elucidate the chemical
structure and thermal behaviour by elemental analyses, spectral (IR and electronic) characterization, number-average molecular
determination and thermogravimetric analysis (TG). In addition to these, magnetic susceptibility measurements have also been
carried out for studying geometry and metal-ligand stoichiometry of polymeric chelates.
The chemical structure of polychelates on the basis of elemental and IR characterization suggests that the bidentate ligand
(H2L) coordinates to metal ions through oxygen atom of the phenolic hydroxyl group by replacing hydrogen atom and nitrogen of
the quinoline ring. The studies of magnetic moments and electronic spectra reveal that all polychelates with octahedral geometry
are paramagnetic in nature except that of Zn(II) chelate, which is diamagnetic. The thermogravimetric analysis of parent ligand
and its metal chelates have shown remarkable difference in mode of thermal decomposition and their thermal stabilities. The
kinetic parameter, energy of activation (Ea) of thermal decomposition has also been estimated by Broido method.