Fluorescent polymeric ionic liquids for the detection of nitroaromatic explosives
Fluorescent polymeric ionic liquids for the detection of nitroaromatic explosives
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DOI：
10.1039/c4ta02766c
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发表时间：
2014-08
影响因子：
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通讯作者：
Sayali V. Shaligram;P. Wadgaonkar;U. K. Kharul
中科院分区：
文献类型：
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作者：
Sayali V. Shaligram;P. Wadgaonkar;U. K. Kharul
我们首次报道了具有芘和蒽荧光基团的聚合物离子液体(PILS)在检测硝基芳香族化合物(NAC)中的适用性。通过热化学和力学性能稳定的聚苯并咪唑(PBI)的后处理，合成了这些功能化的PILs。形成的PILs通过荧光强度猝灭来评价它们检测NACS的能力。研究发现，在含芘和菲的PILs中，NaCS的溶液荧光强度(如硝基苯(NB)、2，4，6-三硝基甲苯(TNT)和苦味酸(PA))均迅速猝灭。PA的溶液相Stern-Volmer猝灭常数高于其他NaC。在这些有希望的结果之后，独立的薄膜(∼12μm厚)也被NaC以及可能的不同性质的干扰物所猝灭。当这些薄膜暴露在常温常压下饱和的NaCS蒸气中时，也显示出快速和选择性的荧光猝灭。常见干扰物的存在对PIL膜的荧光发射影响很小。此外，猝灭后荧光强度可以恢复，使这些PIL膜能够重复用于检测NaC。这些薄膜的智能性能和易于制备使其成为在可能存在干扰的情况下开发敏感的NACS检测传感器设备的有吸引力的候选材料。
We report, for the first time, applicability of film forming polymeric ionic liquids (PILs) possessing pyrene and anthracene fluorophores for the detection of nitroaromatics (NACs). These functionalized PILs were synthesized via post modification of thermo-chemically and mechanically stable polybenzimidazole (PBI). Formed PILs were evaluated for their ability to detect NACs through quenching of fluorescence intensity. Quenching of fluorescence intensity in solution state for NACs, such as nitrobenzene (NB), 2,4,6-trinitrotoluene (TNT) and picric acid (PA), was found to be rapid in both the PILs possessing pyrene and anthracene. The solution-phase Stern–Volmer quenching constants for PA were higher than for other NACs. After these promising results, self-standing films (∼12 μm thick) were also evaluated for fluorescence quenching by NACs as well as possible interferents of different nature. These films also exhibited rapid and selective fluorescence quenching when exposed to the saturated vapors of NACs at ambient temperature and pressure. Fluorescence emission of PIL films was affected little by the presence of commonly found interferents. Furthermore, fluorescence intensity could be recovered after the quenching, enabling the reuse of these PIL films for detection of NACs. Smart performance of these films and ease of preparation qualify them as attractive candidates in developing sensor devices for sensitive NACs detection in presence of possible interferents.