Synthesis and fluorescence properties of rare earth metal ion–polymer ligand–low molecular weight ligand ternary complexes

Abstract

AbstractEu3+‐containing polymer ternary complexes were synthesized using different kinds of functional polymers such as poly(benzylmalonic acid styrene) (PBMAS), poly(benzylacetone styrene) (PBAAS), and poly(benzyl‐azo‐o‐hydroxybenzoic acid styrene) (PBAHBAS) as polymer ligands. The structures of the complexes were investigated by elemental analysis and IR spectroscopy. The fluorescence intensity of Eu3+–polymer–TTA (2‐thenoyltrifuoroacetone ion) complexes was decreased in the order PBMAS(61) > PBAAS(42) > PBAHBAS(32). In system of Eu3+–PBMAS–low molecular weight ligand, the emission spectrum shape, the fluorescence intensity, and the wavelength of the maximum emission peak were changed when the low molecular weight ligand was varied. The fluorescence intensity of the Eu3+–PBMAS–TTA ternary complex was 610 times stronger than that of the Eu3+–PBMAS binary complex and 160 times stronger than that of Eu3+–PBMAS–oxine complex. The fluorescence intensity of the Eu3+–PBAAS–TTA complex was enhanced greatly when the proper mol ratio of HTTA/Eu3+ and pH in the reaction were chosen.