Artículos de revistas
Synthesis and Study of the Photophysical Properties of a New Eu(3+) Complex with 3-Hydroxypicolinamide
Fecha
2011Registro en:
JOURNAL OF FLUORESCENCE, v.21, n.4, p.1575-1583, 2011
1053-0509
10.1007/s10895-011-0846-y
Autor
ROSA, Ieda Lucia Viana
SOUSA FILHO, Paulo Cesar de
NERI, Claudio Roberto
SERRA, Osvaldo Antonio
FIGUEIREDO, Alberthmeiry Teixeira de
VARELA, Jose Arana
LONGO, Elson
Institución
Resumen
This work reports on the synthesis and characterization of a new complex of Eu(3+) with the 3-hydroxypicolinamide ligand (Hhpa). Here we present an approach for obtaining bis[2-carbamoyl(kappa O)pyridin-3-olato(kappa O`)] lanthanide complexes, which were characterized through elemental analysis, thermal analysis, infrared and photoluminescence spectroscopies (emission, excitation, luminescence lifetimes, quantum efficiencies, Judd-Ofelt parameters and quantum yields). Although hpa can act as a bidentate ligand in different conformations, the results attest for the occurrence of a unique coordination site of low symmetry for the Eu(3+) ions, in which two anionic hpa ligands coordinate the cations through an O/O chelating system. The phosphorescence of the synthesized gadolinium complex provides the energy of the triplet state, which is determined to be at 20,830 cm(-1) over the ground state. This makes the Hhpa ligand very adequate for sensitizing the Eu(3+) luminescence, which leads to a very efficient antenna effect and opens a wide range of applications for the complex in light emitting organic-inorganic devices.