期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 208, 期 2-3, 页码 110-116出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2009.09.003
关键词
Homodinuclear lanthanide complexes; 2,2 '-Bipyrimidine; Photoluminescence; Characteristic luminescence; Quantum efficiency
资金
- National Natural Science Foundation of China [20701019, 20971067, 20721002]
- Natural Science Foundation of Jiangsu Province [BK2008257]
- National Basic Research Program of China [2007CB925103]
- Major State Basic Research Development Program [2006CB806104]
- Research Fund for the Doctoral Program of Higher Education [20070284053]
A series of homodinuclear lanthanide complexes Ln(2)(HTH)(6)Bpm (where Ln=Eu, Sm, Er, Yb, Pr; HTH = 4,4,5,5,6,6,6-heptafluroro-1-(2-thienyl)hexane-1,3-dione; Bpm = 2,2'-bipyrimidine) were synthesized and the photoluminescence properties of these complexes are described. After ligand-mediated excitation of the complexes, they all show the characteristic luminescence of the corresponding Ln(3+) ions in the visible and NIR regions attributed to efficient energy transfer from the ligands to the metal centres. For the Eu-2(HTH)(6)Bpm complex a lifetime of 738.8 mu s (100%, chi(2) = 1.362) is found in solid and two life-times of 455.4 mu s (12.88%) and 618.5 mu s (87.12%) (chi(2) = 1.652) are found in CH2Cl2 solution, respectively. Its quantum efficiency in air-equilibrated CH2Cl2 solution is found to be 28.4%, by using air-equilibrated aqueous [Ru(bpy)(3)](2+)center dot 2Cl(-) solution as reference sample (phi(std) = 2.8%). (C) 2009 Elsevier B.V. All rights reserved.
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