Kumar Rajput Saurabh, Kapoor Atul, Yogi Abhishek, Yarlagadda Venkateswarlu, Suresh Mothika Venkata
Department of Chemistry, Indian Institute of Technology (IIT) Kanpur, Kanpur, 208016, India.
Department of Physics, Indian Institute of Technology (IIT) Kanpur, Kanpur, 208016, India.
Chem Asian J. 2024 Dec 16;19(24):e202400939. doi: 10.1002/asia.202400939. Epub 2024 Nov 7.
Nitroaromatic explosive sensing plays a critical role in ensuring public security and environmental protection. Herein, we report 2-pyridyl-thiazolothiazole (pyTTz) integrated blue-fluorescent π-conjugated porous polymer nanosheets, NTzCMP and TzCMP for selective sensing of picric acid (PA) among nitrophenol explosives. Acid-base interactions between PA and pyTTz of CMP lead to H-bonding interactions, where the hydroxy group of PA engaged in weak H-bonding interactions with pyridine and TTz of pyTTz moiety. This led to a strong fluorescence quenching of CMPs-such formation of ground state complex was supported by linear Stern-Volmer quenching plots, unaltered excited state lifetimes, and detailed FTIR analysis of PA exposed CMPs. Interestingly, both CMPs exhibited an excellent response to smaller analytes such as o-nitrotoluene compared to 2,4-dinitrotoluene. Both NTzCMP and TzCMP CMPs exhibited high K values of 9×10 and 2.1×10 M for PA and the corresponding limit of detection values were found to be 0.46 and 1.6 ppm, respectively.
硝基芳香族炸药传感在确保公共安全和环境保护方面起着至关重要的作用。在此，我们报道了2-吡啶基-噻唑并噻唑（pyTTz）集成的蓝色荧光π共轭多孔聚合物纳米片，即NTzCMP和TzCMP，用于在硝基酚类炸药中选择性传感苦味酸（PA）。PA与CMP的pyTTz之间的酸碱相互作用导致氢键相互作用，其中PA的羟基与pyTTz部分的吡啶和TTz形成弱氢键相互作用。这导致了CMPs的强烈荧光猝灭——基态复合物的这种形成得到了线性Stern-Volmer猝灭图、不变的激发态寿命以及对暴露于PA的CMPs进行的详细FTIR分析的支持。有趣的是，与2,4-二硝基甲苯相比，两种CMPs对较小的分析物如邻硝基甲苯都表现出优异的响应。NTzCMP和TzCMP两种CMPs对PA的K值分别高达9×10和2.1×10 M，相应的检测限分别为0.46和1.6 ppm。
