Estudos espectroscópicos e estruturais dos polímeros de coordenação 2D, ∞[Tb(DPA)(HDPA)] e ∞[Gd(DPA)(HDPA)]

• Autor(a) principal: Rodrigues, Marcelo Oliveira
• Data de Publicação: 2009
• Outros Autores: Silva, Antonio Marcos de Brito, Alves Júnior, Severino, Simone, Carlos Alberto de, Araújo, Adriano Antunes de Souza, Carvalho, Pedro Henrique V. de, Santos, Sílvia Caroline G., Freire, Ricardo Oliveira, Mesquita, Maria Eliane
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: https://ri.ufs.br/handle/riufs/623
• topic: Polímeros de coordenação; Lantanídeos; Luminescência

This paper presents the synthesis of the coordination polymers ∞[Ln(DPA)(HDPA)] (DPA=2,6-pyridinedicarboxylate; Ln= Tb and Gd), their structural and spectroscopic properties. The structural study reveals that the ∞[Ln(DPA)(HDPA)] has a single Ln+3 ion coordinated with two H2DPA ligands in tridentade coordination mode, while two others H2DPA establish a syn-bridge with a symmetry-related Ln3+, forming a two-dimensional structure. The spectroscopic studies show that ∞[Tb(DPA)(HDPA)] compound has high quantum yield (qx≈50.0%), due to the large contribution of radiative decay rate. Moreover triplet level is localized sufficiently over the emitter level 5D4 of theTb3+ ion, avoiding a retrotransference process between these states.