Structural and spectroscopic studies of the 2D coordination polymers, ∞[Tb(DPA)(HDPA)] and ∞[Gd(DPA)(HDPA)]

Quimica nova

Simone, Carlos A. De¹  Rodrigues, Marcelo O.²  Brito-Silva, Antonio M.²  Alves Júnior, Severino²  Araújo, Adriano Antunes S.³  Aragão, Kennedy Alexandre S.³  Freire, Ricardo O.³  Carvalho, Pedro Henrique V. de³  Santos, Sílvia Caroline G.³  Mesquita, Maria Eliane³ 

[1] Universidade Federal de Alagoas, Maceió, Brasil;Universidade Federal de Pernambuco, Recife, Brasil;Universidade Federal de Sergipe, São Cristóvão, Brasil

关键词: lanthanides;    coordination polymers;    luminescence.;   

DOI  :  10.1590/S0100-40422009000200004

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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

【 授权许可】

CC BY