期刊
INORGANICA CHIMICA ACTA
卷 362, 期 10, 页码 3821-3828出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2009.05.001
关键词
Zn-Ln heterometallic complex; Crystal structure; Sensitization; Luminescence
资金
- National Natural Science Foundation of China [20571037, 90201018]
- project of innovative group of Liaoning Province [2007T092]
- science and technology research project of Educational Department of Liaoning Province [20060475]
- open fund of National Laboratory of Rare Earth Material Chemistry and Application, Peking University of China
Six novel heterometallic Zn-Ln coordination polymers {[ZnLnCl(pydc)(2)(H2O)(6)]center dot 3H(2)O}(n) (Ln = Nd 1, Pr 2, Sm 3, Eu 4, Tb 5, Dy 6; pydc = pyridine-2,5-dicarboxylate) were synthesized by the hydrothermal method, and their structures were measured by the single-crystal X-ray diffraction. The IR and UV-Vis-NIR absorption spectra, and the luminescence spectra in the visible and near-infrared (NIR) regions of the six complexes were determined at room temperature. They possess the same crystal structure, and the Zn(II) and Ln(III) ions in each complex are bridged into 1D infinite chain by pyridine-2,5-dicarboxylates. Meanwhile, there are numerous hydrogen bonds which result in the 3D hydrogen bonding network in the crystal. In the visible and NIR regions, the emission spectra of the complexes show the characteristic bands of the corresponding Ln(III) ions, which are mainly attributed to the sensitization from the d-L-moiety to f-L-moiety after forming the Zn-Ln complexes. In this paper, we first report the Zn-Sm complex which can exhibit the emission bands of Sm(III) in the NIR region, and discuss the sensitization from the d-L-moiety to f-L-moiety on the basis of the different characteristics of levels for different Ln(III) ions. (C) 2009 Elsevier B.V. All rights reserved.
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