富电子LMOF对有机农药的检测机理研究

Mechanism research of organic pesticides detection by rich electronic LMOF

利用1例蓝色荧光的富电子金属有机骨架LMOF-a实现对有机农药百菌清、除草醚、氟乐灵及2,6-二氯-4-硝基苯胺快速、高效的发光检测。光谱分析及密度泛函理论计算表明,LMOF-a对除草醚的检测机理为电荷转移机理,而对百菌清、氟乐灵及2,6-二氯-4-硝基苯胺的检测机理同时包含电荷转移机理及荧光共振能量转移机理。经Stern-Volmer方程拟合检测数据,LMOF-a对2,6-二氯-4-硝基苯胺具有最高的检测效率,KSV值达(4.778±0.590)L/mmol,检测限低至0.014 mmol/L。研究为开发快速、高效的有机农药检测技术提供理论参考及技术支持。

A blue fluorescent electron-rich metal organic framework LMOF-a was used to realize fast and efficient luminescence detection of organic pesticides chlorothalonil,herbicide,trifluralin and 2,6-dichloro-4-nitroaniline.Spectral analysis and density functional theory calculations indicated that the detection mechanism of nitrofen by LMOF-a is attributed to charge transfer while the detection mechanisms of trifluralin,chlorothalonil,and 2,6-dichloro-4-nitroaniline by LMOF-a are attributed to charge transfer and fluorescence resonance energy transfer.The Stern-Volmer equation was applied to fit the detection data.LMOF-a demonstrated the highest detection efficiency of 2,6-dichloro-4-nitroaniline with KSVup to(4.778±0.590)L/mmol,and the minimum detection limit down to 0.014 mmol/L.This research provides theoretical reference and technical support for the development of fast and high-efficiency detection of organic pesticides.