双核铕与2,5-二氟苯甲酸及2,2′-联吡啶配合物的合成、晶体结构及表征
Synthesis, Crystal Structure and Characterization of a Binuclear Europium 2,5-difluorobenzoic Acid Complex with 2,2′-bipyridine
作者单位
吴小说 首都师范大学化学系北京 100037 
李 夏 首都师范大学化学系北京 100037 
摘要: 用溶液法合成了混配配合物[Eu(2,5-DFBA)3(2,2′-bipy)]2(2,5-DFBA=2,5-二氟苯甲酸根,2,2′-bipy=2,2′-联吡啶),并测定了其晶体结构。该晶体属于三斜晶系,P1空间群。在配合物中,2个Eu3+离子被4个2,5-二氟苯甲酸根以双齿桥联和三齿桥联2种方式连接;每个Eu3+离子的配位数为9,分别与4个桥联2,5-二氟苯甲酸根的5个氧原子、1个双齿螯合2,5-二氟苯甲酸根的2个氧原子以及1个2,2′-联吡啶分子的2个氮原子配位。该配合物在紫外灯照射下发出强烈的红光,在荧光光谱的580、591、613、648和693 nm处出现5条谱线,分别是由Eu3+离子的5D07Fj (j=0~4)跃迁产生的。
关键词: 铕配合物  2,5-二氟苯甲酸  晶体结构  发光
基金项目: 
Abstract: [Eu(2,5-DFBA)3(2,2′-bipy)]2 (2,5-DFBA=2,5-Difluorobenzoate, 2,2′-bipy=2,2′-bipyridine) has been obtained by solvent method and characterized by X-ray diffraction single-crystal structure analysis. The com- plex crystallizes in Triclinic system, P1 space group with a=1.137 2(2) nm, b=1.222 7(2) nm, c=1.263 7(3) nm, α=104.17(3)°, β=103.08(3)°, γ=113.61(3)°. In the complex, two Eu3+ ions are linked by four 2,5-DFBA ligands in bridging-bidentate and bridging-chelating coordination modes. Each Eu3+ ion is nine-coordinated to five oxygen atoms of four bridge 2,5-DFBA ligands, two oxygen atoms of one chelating-bidentate 2,5-DFBA ligand, two nitrogen atoms of one 2,2′-bipy molecule. The complex exhibits strong red fluorescence under ultraviolet light. The fluorescence spectrum has five peaks at 580, 591, 613, 648 and 693 nm, which caused by 5D07Fj (j=0~4) transitions of Eu3+ ion. CCDC: 675498.
Keywords: europium complex  2,5-difluorobenzoic acid  crystal structure  luminescence
 
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吴小说,李 夏.双核铕与2,5-二氟苯甲酸及2,2′-联吡啶配合物的合成、晶体结构及表征[J].无机化学学报,2008,24(10):1621-1625.
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