A luminescent metal-organic framework with tetragonal nanochannels as an efficient chemosensor for nitroaromatic explosives detection
A luminescent metal-organic framework with tetragonal nanochannels as an efficient chemosensor for nitroaromatic explosives detection
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具有四方纳米通道的发光金属有机框架作为硝基芳香族爆炸物检测的有效化学传感器
DOI：
10.1039/d1ce00331c
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发表时间：
2021
期刊：
影响因子：
3.1
通讯作者：
Zhong-Min Su
中科院分区：
文献类型：
--
作者：
Wei Xie;Wei Jiang;Guang-Juan Xu;Shu-Ran Zhang;Yan-Hong Xu;Zhong-Min Su
利用荧光配体H3TPA在溶剂热条件下合理制备了具有四方纳米通道的新型三维MOF [(zn40o)(H2O)2(TPA)2]·8DMA (1) （H3TPA = 4,4′，4”-硝基三苯甲酸；DMA = N，N-二甲基乙酰胺）。MOF 1展示了一个独特的（3,6）连接的纳米级方形通道网络，显示出强烈的蓝色发射。有趣的是，1可以作为荧光探针，利用荧光猝灭现象，高效、选择性地探测硝基芳香族炸药。随着-NO2基团数量的增加，荧光猝灭变得更加明显，这可能是因为给电子骨架向吸电子硝基芳烃分析物的能量转移更大。值得注意的是，该传感器对苦味酸（PA）特别敏感，在PA浓度低至30ppm时显示完全荧光猝灭。MOF - 1可回收用于硝基芳香族炸药的检测，具有良好的可回收性。此外，通过理论计算验证了荧光猝灭的光致电子转移机理。
A novel 3D MOF [(Zn4O)(H2O)2(TPA)2]·8DMA (1) (H3TPA = 4,4′,4′′-nitrilotrisbenzoic acid; DMA = N,N-dimethylacetamide) with tetragonal nanochannels has been rationally obtained under solvothermal conditions using the fluorescent ligand H3TPA. MOF 1 demonstrates a unique (3,6)-connected network with nanosized square channels, displaying strong blue emission. Interestingly, 1 can be used as a fluorescent probe, which can detect nitroaromatic explosives efficiently and selectively via fluorescence quenching phenomena. As the number of –NO2 groups increase, fluorescence quenching becomes more obvious, which is maybe because the energy transfer from the electron-donating framework to electron-withdrawing nitroaromatic analytes becomes greater. Notably, the sensor is particularly sensitive to picric acid (PA), showing complete fluorescence quenching at a PA concentration as low as 30 ppm. MOF 1 can be recycled in the detection of nitroaromatic explosives with excellent recyclability. Additionally, the photo-induced electron transfer mechanism was validated through theoretical calculations for the fluorescence quenching.