Synthesis, crystal structure and fluorescence property of 1-D europium complex with 2,3-difluorobenzoate
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：SONG Jinhao WU Xiaoshuo LI Xia
Key words：europium complex; 2,3-difluorobenzoic acid; crystal structure; fluorescence; rare earths;
Abstract: A new chain europium complex [Eu(2,3-DFBA)_3·(H_2O)_2]_n (2,3-DFBA=2,3-difluorobenzoate) was synthesized by solvent method.X-ray single-crystal diffraction analysis revealed that Eu~(3+) ions were linked through 2,3-DFBA groups via alternate bidentate-bridging and tridentate chelating-bridging coordination modes to form a one-dimensional (1-D) polymeric chain. Each Eu~(3+) ion is eight-coordinated by six O atoms of five 2,3-DFBA ligands and two water molecules. The abundant hydrogen bonds between chains resulted in a two-dimensional (2-D) network structure. The titled complex crystallizes in monoclinic system, space group P2_1/c, with a=0.79977(2) nm, b=-2.99156(7) nm,c=0.93260(2) nm, and β=100.691(1)°. The complex exhibited strong red fluorescence under ultraviolet light, and the ~5D_0→~7F_j(j=0～4) transi-tions of Eu~(3+) ion were observed in its emission spectrum.
SONG Jinhao1，WU Xiaoshuo1，LI Xia1
(1.Department of Chemistry,Capital Normal University,Beijing 100048,China)
Abstract:A new chain europium complex [Eu(2,3-DFBA)_3·(H_2O)_2]_n (2,3-DFBA=2,3-difluorobenzoate) was synthesized by solvent method.X-ray single-crystal diffraction analysis revealed that Eu~(3+) ions were linked through 2,3-DFBA groups via alternate bidentate-bridging and tridentate chelating-bridging coordination modes to form a one-dimensional (1-D) polymeric chain. Each Eu~(3+) ion is eight-coordinated by six O atoms of five 2,3-DFBA ligands and two water molecules. The abundant hydrogen bonds between chains resulted in a two-dimensional (2-D) network structure. The titled complex crystallizes in monoclinic system, space group P2_1/c, with a=0.79977(2) nm, b=-2.99156(7) nm,c=0.93260(2) nm, and β=100.691(1)°. The complex exhibited strong red fluorescence under ultraviolet light, and the ~5D_0→~7F_j(j=0～4) transi-tions of Eu~(3+) ion were observed in its emission spectrum.
Key words:europium complex; 2,3-difluorobenzoic acid; crystal structure; fluorescence; rare earths;
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