252638-53-2Relevant academic research and scientific papers
Lanthanide radii controlled one-dimensional polymer and dinuclear complexes and their fluorescent properties
Hu, Xiong,Dou, Wei,Xu, Chan,Tang, Xiaoliang,Zheng, Jiangrong,Liu, Weisheng
experimental part, p. 3412 - 3418 (2011/06/18)
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),1 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%.
