title: Synthesis, characterization and luminescent properties of europium complexes with 2,4,6-tris-(2-pyridyl)-s-triazine as highly efficient sensitizers.
abstract: Using 2,4,6-tris-(2-pyridyl)-s-triazine (TPTZ) as a neutral ligand, and p-hydroxybenzoic acid, terephthalic acid and nitrate as anion ligands, five novel europium complexes have been synthesized. These complexes were characterized using elemental analysis, rare earth coordination titrations, UV/vis absorption spectroscopy and infrared spectroscopy. Luminescence spectra, luminescence lifetime and quantum efficiency were investigated and the mechanism discussed in depth. The results show that the complexes have excellent emission intensities, long emission lifetimes and high quantum efficiencies. The superior luminescent properties of the complexes may be because the triplet energy level of the ligands matches well with the lowest excitation state energy level of Eu(3+). Moreover, changing the ratio of the ligands and metal ions leads to different luminescent properties. Among the complexes, Eu2(TPTZ)2(C8H4O4)(NO3)4(C2H5OH)·H2O shows the strongest luminescence intensity, longest emission lifetime and highest quantum efficiency.
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Kang
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Ying-Nan
authors.initials: YN
authors.lastname: Chen
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Ai-Ling
authors.initials: AL
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Li
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Yan-Rong
authors.initials: YR
authors.lastname: Qu
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Hai-Xia
authors.initials: HX
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Hai-Bin
authors.initials: HB
authors.lastname: Chu
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot, China.
authors.forename: Yong-Liang
authors.initials: YL
authors.lastname: Zhao
mesh_terms: D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D014227:Triazines / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D014227:Triazines; D005063:Europium; C002849:2,4,6-tripyridyl-s-triazine
keywords: 2,4,6-tris-(2-pyridyl)-s-triazine; aromatic carboxylic acid; europium complex; luminescence property