Journal of Fluorescence 2011-07-01

Synthesis and study of the photophysical properties of a new Eu3+ complex with 3-hydroxypicolinamide.

Ieda Lucia Viana Rosa, Paulo Cesar de Sousa Filho, Claudio Roberto Neri, Osvaldo Antonio Serra, Alberthmeiry Teixeira de Figueiredo, José Arana Varela, Elson Longo

Index: J. Fluoresc. 21(4) , 1575-83, (2011)

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Abstract

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(κO)pyridin-3-olato(κO')] 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.© Springer Science+Business Media, LLC 2011