Crystal Structure and Fluorescence Property of Lanthanide Coordination Polymer {[Eu(2,5-PDA)(OAc)(H2O)]·1.5H2O}n

Chem. J. Chinese Universities

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Crystal Structure and Fluorescence Property of Lanthanide Coordination Polymer {[Eu(2,5-PDA)(OAc)(H₂O)]·1.5H₂O}_n

LIU Chong-Bo¹, XIANG Li², LI Xin-Xin³, WEN Hui-Liang⁴

1. Department of Chemistry, Nanchang University, Nanchang 330047, China;
2. Department of Chemistry, Beijing Normal University, Beijing 100875, China;
3. The Analytical and Testing Center, Beijing Normal University, Beijing 100875, China;
4. Key Laboratory of Food Science of Ministry of Education, Nanchang University, Nanchang 330047, China

Received:2006-03-22 Revised:1900-01-01 Online:2006-12-10 Published:2006-12-10
Contact: WEN Hui-Liang

Abstract

Abstract: The europium coordination polymer [Eu(PDA)(OAc)(H₂O)]_n·1.5H₂O(PDA=2,5-pyridinedicarboxylate, OAc=acetate) was synthesized by hydrothermal method, and characterized by single crystal X-ray diffraction and elemental analysis. The crystallographic data show that the complex crystallizes in a monoclinic system, space group P2₁/n, cell parameters a=0.935 01(15) nm, b=0.834 77(13) nm, c=1.677 9(3) nm, β=106.18°, V=1.257 8(3) nm³, Z=4, the final indentical factors [I>2σ(I)]: R₁=0.024 3, wR₂=0.060 5. One carboxyl group of PDA ligand and OAc ligand links two europium(Ⅲ) ions of two asymmetric units to form a dinuclear unit, while PDA ligands join dinuclear units from two directions, which are 88° and 56° dihedral angles with acetate ligands, respectively. Along the α-axis, a three-dimensional structure constructed by coordinated bonds is thus formed by PDA and OAc ligands, in which uncoordinated water molecules exist in the crystal via hydrogen bonds with coordinated water molecules. The photoluminescence property of the title compound was also investigated. The intensity ratio I(⁵D₀→⁷F₂/⁵D₀→⁷F₁) is ca. 1.44, which indicates that the Eu(Ⅲ) ion in the title compound is not located at the center of inversion.

Key words: Europium coordination polymer, Hydrothermal synthesis, Crystal structure, Fluorescence

CLC Number:

O614
O648.2

TrendMD:

LIU Chong-Bo¹, XIANG Li², LI Xin-Xin³, WEN Hui-Liang⁴. Crystal Structure and Fluorescence Property of Lanthanide Coordination Polymer {[Eu(2,5-PDA)(OAc)(H₂O)]·1.5H₂O}_n[J]. Chem. J. Chinese Universities, doi: .

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Crystal Structure and Fluorescence Property of Lanthanide Coordination Polymer {[Eu(2,5-PDA)(OAc)(H₂O)]·1.5H₂O}_n

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