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

The synthesis, structural investigation, and photophysical properties of the complex [Tb(TTA)(2)(NO(3)) (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 NO(3)(-) group in the first coordination sphere is suggested and experimentally investigated to explain the anomalous luminescence properties of the new complex [Tb(TTA)(2)(NO(3))(TPPO)(2)]. (C) 2010 Elsevier B.V. All rights reserved.

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)

RENAMI project (Brazilian Molecular and Interfaces Nanotechnology Network)

RENAMI project (Brazilian Molecular and Interfaces Nanotechnology Network)

inctINAMI (CNPq)

inct-INAMI (CNPq)

CNPq-FACEPE-PRONEX

FACEPE

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

CAPES

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)