Influence of different carboxylic acid ligands on luminescent properties of Eu(Lc)_3phen (Lc = MAA, AA, BA, SA) complexes

摘要

A series of rare earth europium complexes with different carboxylic acid ligands Eu(Lc)_3phen (Lc = MAA, AA, BA, SA) were synthesized. The complexes were characterized by FTIR, TG-DSC, XRD, UV absorption spectra, and photoluminescence spectra (PL) to study the structure, thermal stability, the energy absorption, and luminescent properties of the complexes. The results showed that the series complexes are all with good crystallization and relatively high thermal stability. The differences of the luminescent properties of complexes are caused by the different ligand structures. The absorption intensity of the carboxylic acid ligands, BA, was the strongest, followed by the MAA and AA and SA was the weakest. Therefore, the fluorescence intensity of the Eu(BA)_3phen was the strongest, followed by the Eu(MAA) _3phen and Eu(AA)_3phen and the Eu_2(SA) _3phen_2 was the weakest. All complexes showed good luminescence properties.