3d–4f Metal–Organic Framework with Dual Luminescent Centers That Efficiently Discriminates the Isomer and Homologues of Small Organic Molecules

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• 作者：Guang Zeng ; Shanghua Xing ; Xiuru Wang ; Yulin Yang ; Dingxuan Ma ; Hongwei Liang ; Lu Gao ; Jia Hua ; Guanghua Li ; Zhan Shi ; Shouhua Feng
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：February 1, 2016
• 年：2016
• 卷：55
• 期：3
• 页码：1089-1095
• 全文大小：496K
• ISSN：1520-510X

文摘

A 3d–4f luminescent metal–organic framework (MOF), [Tb₂(Cu₈I₈)(C₁₂H₈NO₂)₆(H₂O)₄]·5C₄H₈O₂ (4), and three analogues {[La₂(Cu₈I₈)(C₁₂H₈NO₂)₆(C₄H₈O₂)₂(H₂O)₂]·3C₄H₈O₂·2H₂O (1), [Ce₂(Cu₈I₈)(C₁₂H₈NO₂)₆(H₂O)₄]·5C₄H₈O₂ (2), and [Eu₂(Cu₈I₈)(C₁₂H₈NO₂)₆(H₂O)₄]·5C₄H₈O₂ (3)}, were self-assembled from copper(I) halide clusters and lanthanide metal ions with an organic linker [3-(pyridin-4-yl)benzoic acid] under solvothermal conditions. Compound 4 with high quantum yield (Φ = 68%) exhibits reversible luminescence behavior, accompanying the removal and recovery of guest molecules (1,4-dioxane). Because of the unique porous structure and dual luminescent centers of compound 4, it can efficiently differentiate benzene series with different sizes and provide readouts in corresponding optical signals. Furthermore, it also can unambiguously discriminate the isomers, homologues, and other small molecules with similar structural motifs from one another. The luminescent color of the MOF sensor in different guest solvents has obvious changes that can be clearly distinguished by the naked eye. This multicolor luminescence originates from emissions of the dual luminescent centers, and the emissions have shifted, enhanced, weakened, or quenched to different degrees.