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Post-synthetic modification of a metal-organic framework with a chemodosimeter for the rapid detection of lethal cyanide via dual emission.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-06-03 , DOI: 10.1039/d0dt00837k Rana Dalapati 1 , Soutick Nandi , Shyam Biswas
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-06-03 , DOI: 10.1039/d0dt00837k Rana Dalapati 1 , Soutick Nandi , Shyam Biswas
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A new Hf(IV) based metal–organic framework with the UiO-66 (UiO = University of Oslo) topology was prepared via a standard modulated solvothermal reaction. The weakly emissive MOF material was well characterized via various analytical techniques. The parent MOF was then post-synthetically modified with a highly emissive pyrene based chemodosimeter probe without altering the parent framework structure. The incorporation of the chemodosimeter in the modified MOF material was successfully confirmed by using FT-IR and 1H NMR spectroscopy. The emission behaviour of the parent MOF was changed drastically with a noticeable colour change after post-synthetic modification. After modification, the MOF material showed a very selective colorimetric and fluorometric dual-emissive response towards lethal cyanide ions. A large blue shift (Δλ = 127 nm) was observed in the emission spectra which can be also visualized with the naked eye under a hand held UV lamp. The presence of a vinyl functional group in the chemodosimeter can serve as a potential nucleophilic reaction centre, which was also confirmed by the DFT calculations. The reaction based sensing mechanism of the MOF material was successfully confirmed by 1H NMR spectroscopy. Furthermore, to apply the modified MOF material in real life, the test strip based sensing of cyanide in drinking water was demonstrated.
中文翻译：
使用化学计量仪对金属有机骨架进行后合成修饰，以通过双重发射快速检测致命的氰化物。
通过标准的调制溶剂热反应制备了具有UiO-66（UiO =奥斯陆大学）拓扑结构的基于Hf（IV）的新型金属有机骨架。通过各种分析技术可以很好地表征弱发射MOF材料。然后，在不改变母体骨架结构的情况下，用高发射率的基于based的化学计量仪探针对母体MOF进行后合成修饰。通过使用FT-IR和1成功证实了化学计量仪在改性MOF材料中的掺入1 H NMR光谱。合成后改性后，母体MOF的发射行为发生了巨大变化，颜色发生了明显变化。改性后，MOF材料对致命的氰化物离子显示出非常高的选择性比色和荧光双发射响应。一个大的蓝移（Δ λ的发射光谱也可以被可视化用一只手下肉眼观察= 127 nm）的保持紫外灯。化学光度计中乙烯基官能团的存在可以作为潜在的亲核反应中心，这也通过DFT计算得到了证实。MOF材料基于反应的传感机制已成功通过1确认1 H NMR光谱。此外，为了在现实生活中应用改性的MOF材料，演示了基于测试条的饮用水中氰化物的感测。
更新日期：2020-06-29
中文翻译：
使用化学计量仪对金属有机骨架进行后合成修饰，以通过双重发射快速检测致命的氰化物。
通过标准的调制溶剂热反应制备了具有UiO-66（UiO =奥斯陆大学）拓扑结构的基于Hf（IV）的新型金属有机骨架。通过各种分析技术可以很好地表征弱发射MOF材料。然后，在不改变母体骨架结构的情况下，用高发射率的基于based的化学计量仪探针对母体MOF进行后合成修饰。通过使用FT-IR和1成功证实了化学计量仪在改性MOF材料中的掺入1 H NMR光谱。合成后改性后，母体MOF的发射行为发生了巨大变化，颜色发生了明显变化。改性后，MOF材料对致命的氰化物离子显示出非常高的选择性比色和荧光双发射响应。一个大的蓝移（Δ λ的发射光谱也可以被可视化用一只手下肉眼观察= 127 nm）的保持紫外灯。化学光度计中乙烯基官能团的存在可以作为潜在的亲核反应中心，这也通过DFT计算得到了证实。MOF材料基于反应的传感机制已成功通过1确认1 H NMR光谱。此外，为了在现实生活中应用改性的MOF材料，演示了基于测试条的饮用水中氰化物的感测。
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