Light-up luminescence sensors have been employed in real-time in-situ visual detection of target molecules including volatile organic compounds (VOCs). However, currently employed light-up sensors, which are generally based on the aggregation-induced emission (AIE) or solvent-induced energy transfer effect, exhibit limited sensitivity for light-up detection and poor recycling performances thereby significantly hindering their industrial applications. Inspired by the low-temperature enhanced luminescence phenomenon, we herein propose and show that a guest-lock induced luminescence enhancement mechanism can be used to realize the ultrafast light-up detection of target VOCs. Through introduction of chlorinated hydrocarbons to lock the molecular vibrations within a designed [Cu4I4]-based metal-organic framework (MOF), luminescence intensity could be enhanced significantly at room temperature. This guest-lock induced luminescence enhancement is brought about by weak supramolecular interactions between the host framework and the guest molecules, allowing highly sensitive and specific detection of the guest vapor with ultrafast response time (<1 s). Single crystal X-ray diffraction (SCXRD) analysis of guest molecules-loaded MOFs and density functional theory (DFT) calculations were employed to investigate the host-guest interactions involved in this phenomenon. Moreover, the above MOF sensor successfully achieved real-time detection of a toxic chloroaromatic molecule, chlorobenzene. The guest-lock induced light-up mechanism opens up a route to discovering high-performance ultrafast light-up luminescent sensors for real-time detection applications.

中文翻译：

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基于宿主分子振动锁定的超快发光客体检测

发光发光传感器已被用于包括挥发性有机化合物 (VOC) 在内的目标分子的实时原位视觉检测。然而，目前使用的点亮传感器通常基于聚集诱导发射（AIE）或溶剂诱导的能量转移效应，对点亮检测的灵敏度有限且回收性能差，从而严重阻碍了它们的工业应用。受低温增强发光现象的启发，我们在此提出并展示了一种客锁诱导发光增强机制可用于实现目标 VOC 的超快点亮检测。通过引入氯化烃以将分子振动锁定在设计的基于 [Cu4I4] 的金属有机骨架 (MOF) 内，在室温下发光强度可以显着增强。这种客体锁定诱导的发光增强是由主体框架和客体分子之间的弱超分子相互作用引起的，允许以超快响应时间（<1 s）对客体蒸气进行高度灵敏和特异性检测。采用载客分子 MOF 的单晶 X 射线衍射 (SCXRD) 分析和密度泛函理论 (DFT) 计算来研究这种现象中涉及的主客体相互作用。此外，上述 MOF 传感器成功实现了有毒氯代芳烃分子氯苯的实时检测。访客锁感应点亮机制为发现用于实时检测应用的高性能超快点亮发光传感器开辟了道路。