Synthesis, characterization, and ion-exchange study of benzophenone based resin and its polychelates with lanthanides(III)

The polymeric ligand (resin) was prepared from 2-hydroxy-4- methoxybenzophenone and 1,3-Butanediol in presence of polyphosphoric acid as a catalyst at 160°C for 13 h. The poly[(2-hydroxy-4-methoxybenzophenone) 1,3-butylene] (HMBP-1,3-BD) form 1:2 metal:ligand chelates with La(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), and Dy(III). The polymeric ligand and its polychelates were characterized on the basis of elemental analyses, electronic spectra, magnetic susceptibilities, IR-spectroscopy, NMR, and thermogravimetric analyses. The Number Average Molecular Weight ([image omitted]) was determined by a Vapour Pressure Osmometry (VPO) method. All the polychelates are paramagnetic in nature except La(III), which is diamagnetic in nature. Ion-exchange studies at different electrolyte concentrations, pH and rate have been carried out for lanthanides(III) metal ions.