Synthesis and luminescence of zinc and europium α-thiophene carboxylate polymer

Abstract

The zinc and europium α-thiophene carboxylate polymer with very strong red luminescence was prepared by rheological phase reaction method from zinc acetate, europium oxide and α-thiophenecarboxylic acid. Molecular weight, thermal analyses and X-ray diffraction pattern were measured. 1H NMR, 13C NMR, IR, XPS, UV, excitation and emission spectra were studied. The polymer with amorphous structure and 7.565×10 5 g/mol weight-average molecular exhibited excellent solubility in common organic solvents and better thermal stability under 270 °C in air. The quantum yield of the polymer in acetone was 0.6 relative to quinoline in 0.05 mol/l H 2SO 4 solution. The energy of the π, π * excited state of C 4H 3SCO 2 − can be transferred to Eu 3+ ion resulting in emission from the 5 D 0→ 7 F j of Eu 3+ ion through the polymeric chains. Zn 2+ can effectively enhance the luminescence of Eu 3+ in α-thiophenecarboxylate polymer.