Synthesis, Characterization, and Ion-Exchange Study of Benzophenone Based Resin and Its Polychelates with Lanthanides(III)

Abstract

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 () 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.

Keywords:

• ion-exchange
• Lanthanides(III)
• polychelates
• [poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene]
• thermal study

Acknowledgments

The authors thank the Head, Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, for providing laboratory facilities.

Notes

HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

b = broad, m = medium, s = strong, w = weak. HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

Polystyrene K = 1.15 × 10⁴; HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

HMBP-1,3-BD = poly[(2-hydroxy-4-methoxybenzophenone)1,3-butylene].

Resin, HMBP-1,3-BD = 50 mgs; Mt(NO₃)₂ = 2 mL, 0.1 M; Volume of electrolyte solution = 40 mL; Time = 24 h; Temperature = 30°C; pH of the medium = 5.6.

Resin, HMBP-1,3-BD = 50 mgs; Mt(NO₃)₂ = 2 mL, 0.1 M; Volume of electrolyte solution = 40 mL; Time = 24 h; Temperature = 30°C.

Resin, HMBP-1,3-BD = 50 mgs; Mt(NO₃)₂ = 2 mL, 0.1 M; Volume of electrolyte solution = 40 mL; Time = 24 h; Temperature = 30°C, *Assuming 100% equilibrium is established after 24 h.

Resin, HMBP-1,3-BD = 50 mgs; Mt(NO₃)₂ = 2 mL, 0.1 M; Volume of electrolyte solution = 40 mL; Time = 24 h; Temperature = 30°C.