authors |
Yang, TH; Fu, LS; Ferreira, RAS; Nolasco, MM; Rocha, J; Carlos, LD; Shi, FN |
nationality |
International |
journal |
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY |
author keywords |
Lanthanides; Fluorescence spectroscopy; Quantum efficiency; Crystal growth |
keywords |
METAL-ORGANIC FRAMEWORK; EMISSION QUANTUM YIELD; RARE-EARTH IONS; INTRAMOLECULAR ENERGY-TRANSFER; LANTHANIDE COMPLEXES; PHOTOLUMINESCENCE PROPERTIES; COORDINATION-COMPOUNDS; DIFFERENTIAL-OVERLAP; INTERMEDIATE NEGLECT; THEORETICAL APPROACH |
abstract |
A series of europium Eu- and La-doped complexes with two different crystal structures, namely, EuxLa1-x(phen)(2)(NO3)(3) [phen = 1,10-phenanthroline, x = 1.0 (1), 0.88 (2), 0.73 (3), and 0.52 (4)] and {[EuxLa1-x(phen)(2)(H2O)(2)(NO3)(2)](NO3)2(phen)(H2O)} [x = 0.28 (5) and 0.0 (6)], were synthesized in aqueous solution by using different Eu/La ratios.The complexes were characterized by single-crystal and powder X-ray diffraction, Fourier transform infrared spectroscopy, elemental analysis, thermogravimetry, and scanning electron microscopy. Compounds 1-4 and 5, 6 were obtained for Eu/La molar ratios higher than 5:5 and smaller than 3:7, respectively. The photoluminescence properties of these compounds depend on the crystal structure, which is determined by the Eu/La reactant ratio. Complexes 1-4 exhibit a quantum efficiency ( = 55%) and quantum yield (q = 31%) higher than 5 ( = 23% and q = 6%). The photophysical properties assessed by using the LUMPAC software are in good accord with the experimental values, particularly, the calculated (26%) and measured emission quantum yields (31%; excitation at the ligands at 255 nm). |
publisher |
WILEY-V C H VERLAG GMBH |
issn |
1434-1948 |
year published |
2015 |
issue |
29 |
beginning page |
4861 |
ending page |
4868 |
digital object identifier (doi) |
10.1002/ejic.201500611 |
web of science category |
Chemistry, Inorganic & Nuclear |
subject category |
Chemistry |
unique article identifier |
WOS:000363483900007
|