Synthesis,crystal structure and fluorescence of a new europium complex with 2-bromobenzoate and 2,2’-bipyridine
来源期刊：Journal of Rare Earths2009年第5期
论文作者：邱晓 张艳斌 李夏
文章页码：797 - 800
摘 要：A new complex of {[Eu2（2-BrBA）6（2,2’-bpy）2]2·CH3CH2OH·H2O} （2-BrBA=2-bromobenzoate; 2,2’-bpy=2,2’-bipyridine） was prepared by solvent method and characterized with X-ray single-crystal diffraction, IR spectroscopy, UV spectroscopy, and fluorescence spectroscopy. The complex crystallized in triclinic crystal system, Pī space group, with a=1.17196（4） nm, b=2.36142（9） nm, c=2.59151（9） nm, α=113.266（2）°, β=101.100（2）°, and γ=94.400（2）°. Two independent dinuclear molecules were contained in the asymmetric unit. The two molecules were similar to each other. Each Eu（Ⅲ） ion was nine-coordinated with seven oxygen atoms from five 2-BrBA ligands and two nitrogen atoms from 2,2’-bpy molecule. The carboxylate groups acted as bidentate-chelating, bidentate-bridging and chelating-bridging coordination modes. The complex adopted a distorted monocapped square-antiprism coordination geometry. Five peaks at 579, 591, 613, 652, and 697 nm appeared in the fluorescence spectrum, corresponding to 5D0→7F0, 5D0→7F1, 5D0→7F2, 5D0→7F3, and 5D0→7F4 transition emissions of the Eu（Ⅲ） ion, respectively.
邱晓，张艳斌，李夏
Department of Chemistry,Capital Normal University
摘 要：A new complex of {[Eu2（2-BrBA）6（2,2’-bpy）2]2·CH3CH2OH·H2O} （2-BrBA=2-bromobenzoate; 2,2’-bpy=2,2’-bipyridine） was prepared by solvent method and characterized with X-ray single-crystal diffraction, IR spectroscopy, UV spectroscopy, and fluorescence spectroscopy. The complex crystallized in triclinic crystal system, Pī space group, with a=1.17196（4） nm, b=2.36142（9） nm, c=2.59151（9） nm, α=113.266（2）°, β=101.100（2）°, and γ=94.400（2）°. Two independent dinuclear molecules were contained in the asymmetric unit. The two molecules were similar to each other. Each Eu（Ⅲ） ion was nine-coordinated with seven oxygen atoms from five 2-BrBA ligands and two nitrogen atoms from 2,2’-bpy molecule. The carboxylate groups acted as bidentate-chelating, bidentate-bridging and chelating-bridging coordination modes. The complex adopted a distorted monocapped square-antiprism coordination geometry. Five peaks at 579, 591, 613, 652, and 697 nm appeared in the fluorescence spectrum, corresponding to 5D0→7F0, 5D0→7F1, 5D0→7F2, 5D0→7F3, and 5D0→7F4 transition emissions of the Eu（Ⅲ） ion, respectively.
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