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

Química Nova

Marcelo O. Rodrigues²  Antonio M. Brito-silva²  Severino Alves Júnior²  Carlos A. De Simone¹  Adriano Antunes S. Araújo¹  Pedro Henrique V. De Carvalho¹  Sílvia Caroline G. Santos¹  Kennedy Alexandre S. Aragão¹  Ricardo O. Freire¹  Maria Eliane Mesquita¹ 

[1] ,Universidade Federal de Pernambuco Departamento de Química Fundamental Recife PE ,Brasil

关键词: lanthanides;    coordination polymers;    luminescence;   

DOI  :  10.1590/S0100-40422009000200004

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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