Lanthanide radii controlled one-dimensional polymer and dinuclear complexes and their fluorescent properties
作者:Xiong Hu、Wei Dou、Chan Xu、Xiaoliang Tang、Jiangrong Zheng、Weisheng Liu
DOI:10.1039/c0dt01350a
日期:——
A bi-phosphonate ligand tetraethyl-(2,3,5,6-tetramethyl-1,4-phenylene) bis(methylene)diphosphonate has been designed and synthesized. The bi-phosphonate as a bridging ligand reacts with lanthanide nitrates forming four different types of 1D coordination complexes: ribbon polymer (type I), semi-ribbon polymer (type II), zigzag polymer (type III), and dinuclear-triligand short chain (type IV), which changed according to the decrease of the radius of the lanthanide. They have been characterized by IR spectroscopy, elemental analysis, and X-ray diffraction spectroscopy. The photophysical properties of Sm3+, Eu3+, Tb3+ and Dy3+ complexes at room temperature were also investigated. They exhibit strong fluorescence by excitation of the Ln3+ ion absorption bands and the quantum yield values of Eu3+ and Tb3+ complexes are no less than 20%.
我们设计并合成了一种双膦酸配体--四乙基-(2,3,5,6-四甲基-1,4-亚苯)双(亚甲基)二膦酸盐。作为桥接配体的双膦酸盐与硝酸镧反应形成了四种不同类型的一维配位配合物:带状聚合物(I 型)、半带状聚合物(II 型)、之字形聚合物(III 型)和二核-三配体短链(IV 型)。红外光谱、元素分析和 X 射线衍射光谱对它们进行了表征。此外,还研究了 Sm3+、Eu3+、Tb3+ 和 Dy3+ 复合物在室温下的光物理特性。它们通过激发 Ln3+ 离子吸收带而表现出强烈的荧光,Eu3+ 和 Tb3+ 复合物的量子产率值不低于 20%。