Photocontrolled Reversible Luminescent Lanthanide Molecular Switch Based on a Diarylethene–Europium Dyad

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• 作者：Hong-Bo Cheng ; Guo-Fei Hu ; Zhan-Hui Zhang ; Liang Gao ; Xingfa Gao ; Hai-Chen Wu
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：August 15, 2016
• 年：2016
• 卷：55
• 期：16
• 页码：7962-7968
• 全文大小：470K
• 年卷期：0
• ISSN：1520-510X

文摘

A new europium complex coordinated between a Eu(III) ion and an unsymmetrical diarylperfluorocyclopentene yields a light-controlled diarylethene–europium dyad, DAE@TpyEu(tta)₃, whose photophysical properties can be reversibly switched by optical stimuli. When DAE@TpyEu(tta)₃ is exposed to 365 nm UV light, an efficient intramolecular photochromic fluorescence resonance energy transfer (pc-FRET) occurs between the emission of the Eu³⁺ donor (D) and the absorption of the diarylethene acceptor (A) in closed-form DAE@TpyEu(tta)₃ accompanied by luminescence quenching. However, the pc-FRET process could be effectively inhibited by visible light (λ > 600 nm) irradiation, and the lanthanide emission of DAE@TpyEu(tta)₃ is rapidly recovered. Furthermore, this luminescent lanthanide molecular switch could serve as a highly reliable and sensitive “turn on” fluorescent marker in living cells irradiated by red light without any optical interference.