Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
University of Chinese Academy of Sciences , Beijing 100049, China.
Anal Chem. 2016 Nov 15;88(22):10826-10830. doi: 10.1021/acs.analchem.6b03618. Epub 2016 Oct 26.
In this work, we report the development of one fluorescent carbazole-based oligomer 1-zinc(II) coordination nanofiber which enabled the detection of five classes of explosives, i.e., nitroaromatics (dinitrotoluene, DNT, and trinitrotoluene, TNT), aliphatic nitro-organics (2,3-dimethyl-2,3-dinitrobutane, DMNB), nitramines (cyclotrimethylenetrinitramine, RDX), nitro-esters (pentaerythritol tetranitrate, PETN), and black powder (sulfur). We demonstrate that the coordination of zinc ion with a carbazole-based oligomer 1 allows the formation of the Lewis acid-base complex between explosives and the nanofiber that enhances the electron-accepting ability of the nitro-based explosives and the binding interactions between the sensing nanofibers and explosives. Furthermore, the resulting nanofiber-based sensor exhibited highly sensitive fluorescence quenching when exposed to trace sulfur, thereby enabling the sensitive detection of black powder. Herein, we present a new fluorescent sensor for five classes of explosives, which represents an important advance toward a richer identification of threats.
在这项工作中，我们报告了一种基于荧光咔唑的寡聚物 1-锌（II）配位纳米纤维的开发，该纤维能够检测五类爆炸物，即硝基芳烃（二硝基甲苯、DNT 和三硝基甲苯、TNT）、脂肪族硝基有机物（2,3-二甲基-2,3-二硝基丁烷、DMNB）、硝胺（环三亚甲基三硝胺、RDX）、硝基酯（季戊四醇四硝酸酯、PETN）和黑火药（硫磺）。我们证明，锌离子与基于咔唑的寡聚物 1 的配位允许在爆炸物和纳米纤维之间形成路易斯酸碱复合物，从而增强基于硝基的爆炸物的电子接受能力以及传感纳米纤维与爆炸物之间的结合相互作用。此外，所得的基于纳米纤维的传感器在暴露于痕量硫磺时表现出高度灵敏的荧光猝灭，从而能够灵敏地检测黑火药。本文提出了一种用于五类爆炸物的新型荧光传感器，这是朝着更丰富的威胁识别迈出的重要一步。
