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Luminescence enhancement of the Tb(III) ion with the thenoyltrifluoroacetonate ligand acting as an efficient sensitizer

Teotonio, Ercules E. S. and Silva, Francisco A. and Pereira, Dariston K. S. and Santo, Lidiaine M. and Brito, Hermi F. and Faustino, Wagner M. and Felinto, Maria Claudia F. C. and Santos, Regina Helena and Moreno-Fuquen, Rodolfo and Kennedy, Alan R. and Gilmore, Denise (2010) Luminescence enhancement of the Tb(III) ion with the thenoyltrifluoroacetonate ligand acting as an efficient sensitizer. Inorganic Chemistry Communications, 13 (12). pp. 1391-1395. ISSN 1387-7003

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The synthesis, structural investigation, and photophysical properties of the complex [Tb(TTA)(2)(NO3) (TPPO)(2)] are reported. Unlike the analog tris-diketonate complex [Tb(TTA)(3)(TPPO)(2)], the new complex presents abnormally high luminescence intensity centered on the terbium ion. Our results clearly suggest a higher energy transfer efficiency from the TEA antenna ligand to the Tb(III) ion in the bis-diketonate complex compared with that in the tris-diketonate complex. A mechanism involving the increasing of triplet state energy when one TTA ligand is replaced by the NO3- group in the first coordination sphere is suggested and experimentally investigated to explain the anomalous luminescence properties of the new complex [Tb(TTA)(2)(NO3)(TPPO)(2)]. (C) 2010 Elsevier B.V. All rights reserved.