Synthesis, Structure and Photoluminescent Properties of A Novel Oxadiazole-Functionalized Europium(Ⅲ) Complex
来源期刊：JOURNAL OF RARE EARTHS2005年第5期
论文作者：Wang Zhiqiang Du Chenxia Wu Yangjie Xu Yan Zhou Yinjian
Key words：europium complex; luminescence; crystal structure; rare earths;
Abstract: A new oxadiazole-functionalized ligand, 2-benzamide-5-phenyl-[1,3,4] oxadiazole (HL1) was synthesized. With it as the first ligand, 2-Phenyl-imidazo[4,5-f] 1, 10-phenanthroline (L2) as the second ligand, a novel europium complex [Eu(L1)3L2] was prepared and characterized by X-ray structure analysis and photoluminescent spectrum. The complex crystallizes in triclinic with space group of Pī. The crystal data are as follows: a=1.4892(3) nm, b=1.6639(3) nm, c=1.7258(4) nm, α=9.290(3) nm, β=11.014(3) nm, γ=11.554(3) nm, V=3520.7(12) nm3, Z=2, M=1244, Dc=1.292 g·cm-3, μ=1.381 mm-1 and F(000)=1389. The final R and wR values are 0. 0680 and 0.1557 for 6607 [I＞2σ(I)] unique reflections. In the complex, each Eu(Ⅲ) ion is eight-coordinated by three carbonyl oxygen atoms and three oxadiazole nitrogen atoms from L1, two nitrogen atoms from the L2, forming a distorted square antiprism coordination geometry. The complex shows intense red emission typical of Eu3+ ion under UV excitation, both ligands L1 and L2 exhibit strong antenna effects.
Wang Zhiqiang1，Du Chenxia1，Wu Yangjie1，Xu Yan1，Zhou Yinjian1
(1.Department of Chemistry, Zhengzhou University, Zhengzhou 450052, China)
Abstract:A new oxadiazole-functionalized ligand, 2-benzamide-5-phenyl-[1,3,4] oxadiazole (HL1) was synthesized. With it as the first ligand, 2-Phenyl-imidazo[4,5-f] 1, 10-phenanthroline (L2) as the second ligand, a novel europium complex [Eu(L1)3L2] was prepared and characterized by X-ray structure analysis and photoluminescent spectrum. The complex crystallizes in triclinic with space group of Pī. The crystal data are as follows: a=1.4892(3) nm, b=1.6639(3) nm, c=1.7258(4) nm, α=9.290(3) nm, β=11.014(3) nm, γ=11.554(3) nm, V=3520.7(12) nm3, Z=2, M=1244, Dc=1.292 g·cm-3, μ=1.381 mm-1 and F(000)=1389. The final R and wR values are 0. 0680 and 0.1557 for 6607 [I＞2σ(I)] unique reflections. In the complex, each Eu(Ⅲ) ion is eight-coordinated by three carbonyl oxygen atoms and three oxadiazole nitrogen atoms from L1, two nitrogen atoms from the L2, forming a distorted square antiprism coordination geometry. The complex shows intense red emission typical of Eu3+ ion under UV excitation, both ligands L1 and L2 exhibit strong antenna effects.
Key words:europium complex; luminescence; crystal structure; rare earths;
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