Synthesis and photophysical properties of novel polymeric Eu(III) complex with bicoordination ligand

A novel complex of Eu(III) with bicoordination ligand: 4,4′-bis[2-(2′-pyridyl) benzimidazol-yl]-biphenyl (Bmbp) has been synthesized. The structure of the ligand was characterized by 1H NMR, FT-IR and UV–vis; Eu(III) complex was characterized by FT-IR, UV–vis, elemental analysis, conductivity measurements and gel-permeation chromatography (GPC). The luminescence properties were investigated by UV–vis and fluorescence spectra. The experimental results show that the complex contain more than one Eu(III) ion, the emission at 614 nm from the 5D0→7F2 electronic dipole transition is large enhanced, and the complex is excellent energy transfer from ligand to Eu3+in the solid state. Thermal property measurement and analysis show that it has a good thermal stability.