Synthesis and Study of the Photophysical Properties of a New Eu3+ Complex with 3-Hydroxypicolinamide |
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Authors: | Ieda Lucia Viana Rosa Paulo Cesar de Sousa Filho Claudio Roberto Neri Osvaldo Antonio Serra Alberthmeiry Teixeira de Figueiredo José Arana Varela Elson Longo |
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Affiliation: | 1.Laboratório Interdisciplinar de Eletroquímica e Ceramica, Departamento de Química,Universidade Federal de S?o Carlos,S?o Carlos,Brazil;2.Laboratório de Terras Raras, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeir?o Preto,Universidade de S?o Paulo,Ribeir?o Preto,Brazil;3.Instituto de Química,Universidade Estadual Paulista Júlio de Mesquita Filho,Araraquara,Brazil;4.Universidade Federal de Goiás,Catal?o,Brazil |
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Abstract: | This work reports on the synthesis and characterization of a new complex of Eu3+ 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 Eu3+ 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 Eu3+ 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. |
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