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Highly fluorescent scandium-tetracarboxylate frameworks: selective detection of nitro-aromatic compounds, sensing mechanism, and their application
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-10 , DOI: 10.1039/d0dt03781h Deyi Zhan 1, 2, 3, 4, 5 , Abdul Saeed 1, 2, 3, 4, 5 , Zixuan Li 1, 2, 3, 4, 5 , Chengming Wang 5, 6, 7 , Zhiwu Yu 5, 7, 8, 9, 10 , Junfeng Wang 5, 7, 8, 9, 10 , Nanjing Zhao 4, 5, 7, 11, 12 , Weihong Xu 1, 2, 3, 4, 5 , Jinhuai Liu 1, 2, 3, 4, 5
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-10 , DOI: 10.1039/d0dt03781h Deyi Zhan 1, 2, 3, 4, 5 , Abdul Saeed 1, 2, 3, 4, 5 , Zixuan Li 1, 2, 3, 4, 5 , Chengming Wang 5, 6, 7 , Zhiwu Yu 5, 7, 8, 9, 10 , Junfeng Wang 5, 7, 8, 9, 10 , Nanjing Zhao 4, 5, 7, 11, 12 , Weihong Xu 1, 2, 3, 4, 5 , Jinhuai Liu 1, 2, 3, 4, 5
Affiliation
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Recently, exploring new luminescent metal–organic frameworks (LMOFs) to selectively detect nitro-aromatic compounds (NACs) has been a hot topic of research. Simultaneously, it is still a challenging issue to understand the sensing mechanism of luminescent MOFs interacting with NACs at the molecular level. In this work, highly fluorescent Sc-tetracarboxylate frameworks (Sc-EBTC) have been successfully synthesized through a solvothermal method. The as-prepared Sc-EBTC crystals have good thermal stability, chemical stability as well as strong fluorescence (λex = 320 nm and λem = 400 nm), and they can detect various NACs rapidly (as short as 30 s), selectively and efficiently by the “turn-off” fluorescence mechanism. The detection limits of Sc-EBTC toward 2,4-DNP and 4-NP are quantified to be 5.71 ppb and 6.26 ppb, respectively. Furthermore, to better understand the sensing mechanism, we attempt to use solid-state NMR and X-ray photoelectron spectroscopy to vividly characterize the charge transfer caused by the interaction between NAC molecules and the MOF at the molecular level. Additionally, test strips were made successfully for the practical detection of the NACs. This study demonstrates that the MOF constructed from the H4EBTC ligands might be a promising candidate for the detection of trace NACs.
中文翻译：
高荧光四羧酸scan骨架：硝基芳族化合物的选择性检测，传感机理及其应用
最近，探索新的发光金属有机框架（LMOF）以选择性地检测硝基芳族化合物（NAC）成为了研究的热点。同时，在分子水平上了解发光MOF与NAC相互作用的传感机制仍然是一个具有挑战性的问题。在这项工作中，已经通过溶剂热法成功合成了高荧光度的Sc-四羧酸盐骨架（Sc-EBTC）。所制备的钪EBTC晶体具有良好的热稳定性，化学稳定性以及强荧光（λ EX = 320nm和λ EM= 400 nm），它们可以通过“关断”荧光机制快速有效地检测各种NAC（短至30 s）。Sc-EBTC对2,4-DNP和4-NP的检出限分别定为5.71 ppb和6.26 ppb。此外，为了更好地理解传感机制，我们尝试使用固态NMR和X射线光电子能谱来生动地表征NAC分子与MOF在分子水平上的相互作用所引起的电荷转移。此外，成功地制作了测试条，用于NAC的实际检测。这项研究表明，由H 4 EBTC配体构建的MOF可能是检测痕量NAC的有希望的候选者。
更新日期：2020-11-25
中文翻译：
高荧光四羧酸scan骨架：硝基芳族化合物的选择性检测，传感机理及其应用
最近，探索新的发光金属有机框架（LMOF）以选择性地检测硝基芳族化合物（NAC）成为了研究的热点。同时，在分子水平上了解发光MOF与NAC相互作用的传感机制仍然是一个具有挑战性的问题。在这项工作中，已经通过溶剂热法成功合成了高荧光度的Sc-四羧酸盐骨架（Sc-EBTC）。所制备的钪EBTC晶体具有良好的热稳定性，化学稳定性以及强荧光（λ EX = 320nm和λ EM= 400 nm），它们可以通过“关断”荧光机制快速有效地检测各种NAC（短至30 s）。Sc-EBTC对2,4-DNP和4-NP的检出限分别定为5.71 ppb和6.26 ppb。此外，为了更好地理解传感机制，我们尝试使用固态NMR和X射线光电子能谱来生动地表征NAC分子与MOF在分子水平上的相互作用所引起的电荷转移。此外，成功地制作了测试条，用于NAC的实际检测。这项研究表明，由H 4 EBTC配体构建的MOF可能是检测痕量NAC的有希望的候选者。
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