Citation: Jun-Hui Xue, Xiao-Hui Hua, Li-Min Yang, Wei-Hong Li, Yi-Zhuang Xu, Guo-Zhong Zhao, Gao-Hui Zhang, Ke-Xin Liu, Jia-Er Chen, Jin-Guang Wua. Synthesis, crystal structures and luminescence properties of europium and terbium picolinamide complexes[J]. Chinese Chemical Letters, ;2014, 25(6): 887-891. doi: 10.1016/j.cclet.2014.01.012 shu

Synthesis, crystal structures and luminescence properties of europium and terbium picolinamide complexes

1.
a Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
2.
b State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China;
3.
c Department of Chemistry, Renmin University of China, Beijing 100872, China;
4.
d Department of Physics, Capital Normal University, Beijing 100037, China

Corresponding author: Li-Min Yang, Yi-Zhuang Xu,
Received Date: 20 November 2013
Available Online: 16 December 2013
Fund Project: National High-tech R&D Program of China (863 Program) of MOST (No. 2010AA03A406) (No. 2011CB808304) and the Scientific Research Project of Beijing Municipal Commission of Education and Beijing Natural Science Foundation (No. KZ201310028032) are gratefully acknowledged. The authors thank Prof. Xiang Hao, Tongling Liang and Lin Wang (Institute of Chemistry, Chinese Academy of Sciences) for invaluable assistance with the X-ray crystallography. (863 Program)

The novel coordination structures of europium and terbium chloride-picolinamide complexes (EuCl₃•(C₆H₆N₂O)₂•5H₂O, Eu-pa and TbCl₃•(C₆H₆N₂O)₂•5H₂O, Tb-pa) are reported. The crystal structures in the solid state are characterized by X-ray single crystal diffraction, FTIR, Raman, FIR, THz and luminescence spectroscopy. In the crystal structures, the pyridyl nitrogen and carbonyl oxygen atoms in picolinamide are coordinated to the metal ions to form a five-membered ring structure. The experimental results indicate the similar coordination structures of Eu and Tb-pa complexes and the changes of hydrogen bonds and conformation of the ligands induced by complexation. The results provide models for the coordination structures of lanthanide ions with ligands having amide groups.
- Picolinamide,
- FT-IR,
- Complexation,
- Crystal structure,
- THz
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