Synthesis and characterization of the coordination polymers of Aluminium [III], Cadmium [II] and Lead [II] with the schiff base 1,4-bis[hydroxy-phenylazomethine] phenylene need

ABSTRACT

Coordination polymers of l,4-bis[2-hydroxyphenyl-azomethine] phenylene [BHPAP] with A1[III], Cd[II] and Pb[II] have been prepared in ethanol medium. The optimal pH conditions for preparation of the polymeric complexes were determined by potentiometry study. The protonation constants of 1 1 metal-ligand complexes formed were calculated from the obtained potentiometric data, Polymers formed have been characterised on the basis of elemental analysis, inferared and electronic spectra. Thermal stabilities of the polymers have been investigated by carrying out differential scanning calorimetry and thermogravimetric analysis. Electrical conductivity measurements of the synthesized polychelated polymers showed that they are insulators. The metal contents in all polymers are found to be consistent with 11 metal ligand stoichiometry. The solubility and viscosity of the polymer complexes were also determined