A supramolecular self-assembly material based on cucurbituril and cationic TPE as ultra-sensitive probe of energetic pentazolate salts  

作　　者：Boan Tang Jingxiang Zhong Shutao Wang Shiyu Zhou Yongxing Tang Wei Huang 

机构地区：[1]School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Defence Technology（防务技术）》2024年第5期69-76,共8页Defence Technology

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22175093 and 22007047);the Natural Science Foundation of Jiangsu Province(Grant No.BK20200474);the China Postdoctoral Science Foundation(Grant No.2022M721615)。

摘　　要：The successful synthesis of the pentazolate anion(cyclo-N-5)has been a great breakthrough in the field of energetic materials.However,the detection methods for these energetic materials based on the pentazolate anion are quite rare.Herein,two fluorescent probes for cyclo-N-5anion were designed.Sensor 1(TPE2N)was synthesized with a tetraphenylethylene functionalized by two cationic groups which can generate strong electrostatic interactions with pentazolate anion and result in specific fluorescent changes.Sensor 2 was designed based on sensor 1 and supramolecular cucurbit[7]uril(CB[7]).The unique structural features of CB[7]provide sites for the interaction between the cations and N-5anion in its cavity,which would generate a platform for the detection and enhance the recognition performance.Isothermal titration calorimetry(ITC)experiment and fluorescence titration experiment indicate the binding molar ratio between sensor 1 with CB[7]is 1:2.Both sensors display typical aggregation-induced emission(AIE)features and good water-solubility.The sensors demonstrate excellent sensitivity to pentazole hydrazine salt with high enhancement constant(sensor 1:1.34×10^(6);sensor 2:3.78×10^(6))and low limit of detection(LOD:sensor 1=4.33μM;sensor 2=1.54μM).The formation of an AIE-based supramolecular sensor effectively improves the sensitivity to N-5anion.In addition,the probes also have good selectivity of N-5anion salts.The research would shed some light on the design of novel fluorescent sensors to detect pentazolate-based molecules and provides an example of supramolecular chemistry combined with fluorescent probes.

关 键 词：Pentazolate anion Explosives detection Aggregation-induced emission(AIE) Host-guest interaction 

分 类 号：TQ560.72[化学工程—炸药化工] O657.3[理学—分析化学]