双功能 sp2 碳共轭纳米多孔共价有机框架作为 Janus 荧光传感器检测有害物质,ACS Applied Nano Materials

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双功能 sp2 碳共轭纳米多孔共价有机框架作为 Janus 荧光传感器检测有害物质
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-08-09 , DOI: 10.1021/acsanm.2c02504
Zhaoyu Qiao ₁ , Haoyue Han ₁ , Xuemei Li ₁ , Xiao Wang _{1,

2} , Tao Lan ₃ , Rongyu Wang ₁ , Wenhua Ji _{1,

2}

Affiliation

通过用于“一对多”目标识别的超声辅助一步反应构建发光共价有机框架 (LCOF) 是一项挑战。在这项工作中，我们报告了一种荧光 sp ²c-共价有机框架 (COF) (TzDA-BTAN-COF) 包含规则的纳米多孔结构、不间断的 π 电子离域和缺电子单元。我们探索使用 TzDA-BTAN-COF 对有害物质进行目视检查和荧光定量分析。TzDA-BTAN-COF 作为 Janus 传感器，表现出具有不同荧光特性的双重特性：“开启”和“关闭”。在富电子氧氟沙星 (OFLX) 存在下荧光增强和在缺电子苦味酸 (PA) 和马兜铃酸 (AAS) 存在下荧光猝灭。基于理论计算，荧光开关传感机制可能归因于光诱导电子转移，即电子从供体到受体的转移。此外，TzDA-BTAN-COF 已用于 PA、AAS 和 OFLX 的高灵敏度荧光检测。它在 0.1 至 80、0.01 至 100 和 0.01 至 1 μg mL 的范围内对 PA、AAS 和 OFLX 表现出良好的线性^–1，检测限分别为 32.1、3.3 和 3.0 ng mL ^–1。同时，对真实样品进行了测定，回收率令人满意（95.0-105.5%），分析结果可靠。TzDA-BTAN-COF 是第一个纳米多孔 COF Janus 荧光传感器，用于通过双功能荧光开关传感“一对多”识别和荧光检测不同的有害物质。

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Dual Functional sp2 Carbon-Conjugated Nanoporous Covalent Organic Framework as a Janus Fluorescence Sensor for the Detection of Hazardous Substances

Constructing a luminescent covalent organic framework (LCOF) via an ultrasound-assisted one-step reaction used for “one to many” recognition of targets is a challenge. In this work, we report a fluorescent sp²c-covalent organic framework (COF) (TzDA–BTAN–COF) containing a regular nanoporous structure, uninterrupted π-electron delocalization, and an electron-deficient unit. We explore the use of the TzDA–BTAN–COF for the visual inspection and fluorescent quantitative analyses of hazardous substances. The TzDA–BTAN–COF, as a Janus sensor, exhibited double nature with different fluorescence properties: “turn-on” and “turn-off.” Fluorescence enhancement was exhibited in the presence of electron-rich ofloxacin (OFLX) and fluorescence quenching in the presence of electron-deficient picric acid (PA) and aristolochic acid (AAS). The fluorescence-on and -off sensing mechanism might be attributed to the photoinduced electron transfer by the electron transfer from the donor to the acceptor based on theoretical calculations. In addition, the TzDA–BTAN–COF has been used for the highly sensitive fluorescence detection of PA, AAS, and OFLX. It exhibited good linearity toward PA, AAS, and OFLX over the range from 0.1 to 80, 0.01 to 100, and 0.01 to 1 μg mL^–1 with a limited detection of 32.1, 3.3, and 3.0 ng mL^–1, respectively. Meanwhile, the real samples were measured, with satisfactory recoveries (95.0–105.5%) and reliable analytical results. The TzDA–BTAN–COF is the first nanoporous COF Janus fluorescence sensor for the “one to many” recognition and fluorescence detection of different hazardous substances by dual functional fluorescence-on and -off sensing.

更新日期：2022-08-09

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