Crystal Structure and Highly Luminescent Properties Studies of Bis-尾-diketonate Lanthanide Complexes

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• 作者：Jing Shi ; Yanjun Hou ; Wenyi Chu ; Xiaohong Shi ; Huiquan Gu ; Bilin Wang ; Zhizhong Sun
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 6, 2013
• 年：2013
• 卷：52
• 期：9
• 页码：5013-5022
• 全文大小：544K
• 年卷期：v.52,no.9(May 6, 2013)
• ISSN：1520-510X

文摘

A new bis(尾-diketonate), 1,3-bis(4,4,4-trifluoro-1,3-dioxobutyl)phenyl (BTP), which contains a trifluorinated alkyl group, has been prepared for the synthesis of two series of dinuclear lanthanide complexes with the general formula Ln₂(BTP)₃L₂ [Ln³⁺ = Eu³⁺, L = DME(1), bpy(2), and phen(3); Ln³⁺ = Sm³⁺, L = DME(4), bpy(5), and phen(6); DME = ethylene glycol dimethyl ether, bpy = 2,2鈥?bipyridine, phen = 1,10-phenanthroline]. The crystal structure of the free ligand has been determined and shows a twisted arrangement of the two binding sites around the 1,3-phenylene spacer. X-ray crystallographic analysis reveals that complexes 1, 2, 4, and 5 are triple-stranded dinuclear structures formed by three bis-bidentate ligands with two lanthanide ions. The room-temperature photoluminescence (PL) spectra of complexes 1鈥?b>6 show that this bis-尾-diketonate can effectively sensitize rare earths (Sm³⁺ and Eu³⁺) and produce characteristic emissions of the corresponding Eu³⁺ and Sm³⁺ ions. In addition, two bidentate nitrogen ancillary ligands, 2,2鈥?bipyridine (bpy) and 1,10-phenanthroline (phen), have been employed to enhance the luminescence quantum yields and lifetimes of both series of Eu³⁺ and Sm³⁺ complexes.