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

摘要

The zinc and europium a-thiophene carboxylate polymer with very strong red luminescence was prepared by rheological phase reaction method from zinc acetate, europium oxide and alpha-thiophenecarboxylic acid. Molecular weight. thermal analyses and X-ray diffraction pattern were measured. H-1 NMR, C-13 NMR, IR, XPS, UV, excitation and emission spectra were studied. The polymer with amorphous structure and 7.565 x 10(5) g/mol weight-average molecular exhibited excellent solubility in common organic solvents and better thermal stability under 270 degreesC in air. The quantum yield of the polymer in acetone was 0.6 relative to quinoline in 0.05 mol/l H2SO4 solution. The energy of the pi,pi* excited state of C4H3SCO2- can be transferred to Eu3+ ion resulting in emission from the D-5(0) --> F-7(j) of Eu3+ ion through the polymeric chains. Zn2+ can effectively enhance the luminescence of Eu3+ in a-thiophenecarboxylate polymer. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 13]