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Tailoring the Fluorescence of AIE-Active Metal–Organic Frameworks for Aqueous Sensing of Metal Ions
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acsami.7b17762 Qiyang Li , Xiuju Wu , Xiaoli Huang , Yangjun Deng , Nanjian Chen , Dandan Jiang , Lili Zhao , Zhihua Lin , Yonggang Zhao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acsami.7b17762 Qiyang Li , Xiuju Wu , Xiaoli Huang , Yangjun Deng , Nanjian Chen , Dandan Jiang , Lili Zhao , Zhihua Lin , Yonggang Zhao 1
Affiliation
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A hydroxyl-functionalized ligand was designed for the construction of metal–organic framework (MOF) materials with the aggregation-induced emission (AIE) feature, in which the fluorescence can be deliberately tailored: quenching the fluorescence to an “off” state by the decoration with heterocyclic auxiliary ligand 4,4′-bypyridine (Bpy) in the framework as a quenching agent and triggering the enhanced fluorescence to an “on” state by removal of Bpy through the metal competitive coordination substitution strategy. Our study shows that the occurrence of exciton migration between the AIE linker and conjugated auxiliary ligand Bpy causes fluorescence quenching. Time-dependent density functional theory was employed to understand the photoinduced electron transfer process and explain the origins of fluorescence quenching. Using this strategy, the prepared MOF material can perform as a fluorescence “off–on” probe for highly sensitive detection of Al3+ in aqueous media. The hydroxyl group plays a crucial role in sensing as it can selectively chelate Al3+, which is directly related to the dissociation of nonfluorescent MOF and consequent activation of the AIE process.
中文翻译：
量身定制用于金属离子水感测的AIE-活性金属-有机框架的荧光
羟基官能化的配体被设计用于具有聚集诱导发射（AIE）功能的金属-有机骨架（MOF）材料的构造，其中可以有意地调整荧光：通过将荧光猝灭至“关闭”状态。在框架中使用杂环辅助配体4,4'-吡啶（Bpy）作为淬灭剂进行装饰，并通过金属竞争性配位取代策略去除Bpy，从而将增强的荧光触发为“开”状态。我们的研究表明，在AIE接头和共轭辅助配体Bpy之间发生激子迁移会引起荧光猝灭。随时间变化的密度泛函理论用于理解光诱导的电子转移过程，并解释了荧光猝灭的起源。使用这种策略，在水性介质中为3+。羟基在传感中起着至关重要的作用，因为它可以选择性地螯合Al 3+，这直接与非荧光MOF的解离和随后的AIE过程的活化有关。
更新日期：2018-01-19
中文翻译：
量身定制用于金属离子水感测的AIE-活性金属-有机框架的荧光
羟基官能化的配体被设计用于具有聚集诱导发射（AIE）功能的金属-有机骨架（MOF）材料的构造，其中可以有意地调整荧光：通过将荧光猝灭至“关闭”状态。在框架中使用杂环辅助配体4,4'-吡啶（Bpy）作为淬灭剂进行装饰，并通过金属竞争性配位取代策略去除Bpy，从而将增强的荧光触发为“开”状态。我们的研究表明，在AIE接头和共轭辅助配体Bpy之间发生激子迁移会引起荧光猝灭。随时间变化的密度泛函理论用于理解光诱导的电子转移过程，并解释了荧光猝灭的起源。使用这种策略，在水性介质中为3+。羟基在传感中起着至关重要的作用，因为它可以选择性地螯合Al 3+，这直接与非荧光MOF的解离和随后的AIE过程的活化有关。
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