Photophysical Studies of Europium Coordination Polymers Based on a Tetracarboxylate Ligand

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• 作者：Yan-Li Gai ; Fei-Long Jiang ; Lian Chen ; Yang Bu ; Kong-Zhao Su ; Shaeel A. Al-Thabaiti ; Mao-Chun Hong
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：July 1, 2013
• 年：2013
• 卷：52
• 期：13
• 页码：7658-7665
• 全文大小：518K
• 年卷期：v.52,no.13(July 1, 2013)
• ISSN：1520-510X

文摘

Reaction of europium sulfate octahydrate with p-terphenyl-3,3鈥?5,5鈥?tetracarboxylic acid (H₄ptptc) in a mixed solvent system has afforded three new coordination polymers formulated as {[Eu(ptptc)_0.75(H₂O)₂]路0.5DMF路1.5H₂O}_n (1), {[Me₂H₂N]₂ [Eu₂(ptptc)₂(H₂O)(DMF)]路1.5DMF路7H₂O}_n (2), and {[Eu(Hptptc)(H₂O)₄]路0.5DMF路H₂O}_n (3). Complex 1 exhibits a three-dimensional (3D) metal鈥搊rganic framework based on {Eu₂(渭₂-COO)₂(COO)₄}_n chains, complex 2 shows a 3D metal鈥搊rganic framework constructed by [Eu₂(渭₂-COO)₂(COO)₆]^{2鈥?/sup> dimetallic subunits, and complex 3 features a 2D layer architecture assembling to 3D framework through 蟺路路路蟺 interactions. All complexes exhibit the characteristic red luminescence of Eu(III) ion. The triplet state of ligand H₄ptptc matches well with the emission level of Eu(III) ion, which allows the preparation of new optical materials with enhanced luminescence properties. The luminescence properties of these complexes are further studied in terms of their emission quantum yields, emission lifetimes, and the radiative/nonradiative rates.}