Estudos espectroscópicos e estruturais dos polímeros de coordenação 2D, ∞[Tb(DPA)(HDPA)] e ∞[Gd(DPA)(HDPA)] Structural and spectroscopic studies of the 2D coordination polymers, ∞[Tb(DPA)(HDPA)] and ∞[Gd(DPA)(HDPA)]
| Autor: | Marcelo O. Rodrigues, Antonio M. Brito-Silva, Severino Alves Júnior, Carlos A. De Simone, Adriano Antunes S. Araújo, Pedro Henrique V. de Carvalho, Sílvia Caroline G. Santos, Kennedy Alexandre S. Aragão, Ricardo O. Freire, Maria Eliane Mesquita |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 32, Iss 2, Pp 286-291 (2009) |
| Druh dokumentu: | article |
| ISSN: | 0100-4042 1678-7064 |
| DOI: | 10.1590/S0100-40422009000200004 |
| Popis: | 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 (q x≈ 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. |
| Databáze: | Directory of Open Access Journals |
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