| 光谱学与光谱分析 |
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| Synthesis, Crystal Structure and Luminescent Properties of a Dysprosium CoordinaAtion Polymer Based on Pyridine-2,6-Dicarboxylic Acid |
| FAN Rui-qing, WANG Ping, REN Jin-yu, ZHOU Guang-peng, YANG Yu-lin* |
| Department of Chemistry, Harbin Institute of Technology, Harbin 150001, China |
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Abstract 2-D layered Dy coordination polymer [Dy(PDA)(HPDA)]n (1)(H2PDA=pyridine-2,6-dicarboxylic acid) with (4.82) topological network was synthesized under hydrothermal conditions and was characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. X-ray diffraction analysis reveals that compound 1 is monoclinic，space group P2(1)/c. In the structure of compound 1, metal-centered Dy is connected via O atoms of H2PDA ligands to form a (4.82) topology network. The 3-D supramolecular structure of 1 is constructed through π—π stacking interactions between the adjacent layers. The luminescence properties of 1 were determined by UV-Vis and fluorescence spectrum in solid state at room temperature. The H2PDA and 1 exhibit the similar broad maximum absorption peak at 280 nm, which are attributed to ligand-centered π—π* transition. The fluorescence emission band based on ligand-center and characteristic emission of Dy3+ at the same maximum excitation wavelength of 280 nm were observed in 1. The fluorescence decay curve of complex 1 indicated that the processes of decay consists of two components, of which corresponding lifetimes τ1=3.61 μs and τ2=12.81 μs.
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Received: 2010-09-09
Accepted: 2011-02-20
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Corresponding Authors:
YANG Yu-lin
E-mail: ylyang@hit.edu.cn
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