A number of D–π–A type dyes on the basis of new 2H-[1,2,3]triazolo[4,5-e][1,2,4]triazolo[1,5-a]pyrimidines, bearing various electron-donating carbazole and triphenylamine fragments, have been studied as sensing fluorophores. Fluorescence studies have demonstrated that emission spectra of these compounds in acetonitrile are sensitive to the presence of nitroaromatic explosives, such as 2,4-dinitroanisole (DNAN), picric acid (PA), styphnic acid (SA), 1,3,5-triethoxy-2,4,6-trinitrobenzene (TETNB), 2,4-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT) and nitrobenzene (NB). Detection limits of fluorophores for DNAN, PA, SA, TETNB, DNT and TNT proved to be in the range from 4.82×10⁻¹ to 2.96×10⁻³ mol/L, 2.10×10⁻³ to 5.98×10⁻⁵ mol/L, 1.26×10⁻¹ to 2.02×10⁻⁴ mol/L, 1.58×10⁻¹ to 1.62×10⁻³ mol/L, 1.26×10⁻¹ to 5.61×10⁻⁴ mol/L and 9.01×10⁻² to 2.77×10⁻³ mol/L, respectively. Selective fluorescence quenching response, including a sharp color change under UV irradiation (especially for PA, SA and DNT), makes these compounds promising fluorescence chemosensors for nitroaromatic explosives.

中文翻译：

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新的2H- [1,2,3]三唑并[4,5-e] [1,2,4]三唑并[1,5-a]嘧啶衍生物为发光荧光团，用于检测硝基芳族炸药

基于新的2H- [1,2,3]三唑[4,5-e] [1,2,4]三唑[1,5-a]嘧啶的许多D–π–A型染料已经研究了各种供电子咔唑和三苯胺片段作为传感荧光团。荧光研究表明，这些化合物在乙腈中的发射光谱对硝基芳族爆炸物（例如2,4-二硝基苯甲醚（DNAN），苦味酸（PA），苯甲酸（SA），1,3,5-）的存在敏感。三乙氧基-2,4,6-三硝基苯（TETNB），2,4-二硝基甲苯（DNT），2,4,6-三硝基甲苯（TNT）和硝基苯（NB）。DNAN，PA，SA，TETNB，DNT和TNT的荧光团检出限证明为4.82×10 ^-1至2.96×10 ^-3 mol / L，2.10×10 ^-3至5.98×10 ^-5mol / L，1.26×10 ^-1至2.02×10 ^-4 mol / L，1.58×10 ^-1至1.62×10 ^-3 mol / L，1.26×10 ^-1至5.61×10 ^-4 mol / L和9.01 ×10 ^-2至2.77×10 ^-3 mol / L。选择性的荧光猝灭响应，包括在紫外线照射下（特别是对于PA，SA和DNT）的急剧颜色变化，使这些化合物有望成为用于硝基芳族炸药的荧光化学传感器。