School of Biotechnology and Health Sciences, Wuyi University, Guangdong, 529020, China.
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
Angew Chem Int Ed Engl. 2023 Jun 12;62(24):e202303500. doi: 10.1002/anie.202303500. Epub 2023 May 5.
Indoor detection of volatile organic compounds (VOCs) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions especially in the presence of trace concentrations of VOCs, thus exhibiting poor responsive signal. Herein, we report a new flexible metal-organic framework (MOF) that exhibits interesting pore-opening behavior after immersing in H O. The pore-opening phase shows significant (≈116 folds) and extremely fast (<1 minute) fluorescence enhancement after being exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 0.133 mg L . Thus this material represents the first MOF to achieve visual detection of trace benzene vapor by the naked eyes. Theoretical calculations and single-crystal structure reveal that the special "bilateral π-π stacking" interactions between the host and guest, which facilitate electron transfer and greatly enhance the intensity of fluorescence.
由于痕量水平也存在严重的毒性危害，因此有必要对挥发性有机化合物 (VOCs) 浓度进行室内检测。然而，物理吸附剂通常表现出较弱的相互作用，特别是在痕量 VOCs 存在的情况下，因此表现出较差的响应信号。在此，我们报告了一种新的柔性金属有机骨架 (MOF)，在浸入 H2O 后表现出有趣的孔开启行为。在暴露于饱和苯蒸气后，孔开启相显示出显著的（≈116 倍）和极快的（<1 分钟）荧光增强。苯蒸气的检测限浓度可以计算为 0.133mg·L-1。因此，这种材料代表了第一个通过肉眼实现痕量苯蒸气可视化检测的 MOF。理论计算和单晶结构表明，主体和客体之间特殊的“双边 π-π 堆积”相互作用促进了电子转移并大大增强了荧光强度。
