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Self-Assembled Discrete Molecules for Sensing Nitroaromatics

机译：自组装离散分子，用于感应硝基芳烃

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摘要

Efficient sensing of trace amount nitroaromatic (NAC) explosives has become a major research focus in recent time due to concerns over national security as well as their role as environment pollutants. NO2-containing electron-deficient aromatic compounds, such as picric acid (PA), trinitrotoluene (TNT), and dinitrotoluene (DNT), are the common constituents of many commercially available chemical explosives. In this article, we have summarized our recent developments on the rational design of electron-rich self-assembled discrete molecular sensors and their efficacy in sensing nitroaromatics both in solution as well as in vapor phase. Several p-electron-rich fluorescent metallacycles (squares, rectangles, and tweezers/pincers) and metallacages (trigonal and tetragonal prisms) have been synthesized by means of metal-ligand coordination-bonding interactions, with enough internal space to accommodate electron-deficient nitroaromatics at the molecular level by multiple supramolecular interactions. Such interactions subsequently result in the detectable fluorescence quenching of sensors even in the presence of trace quantities of nitroaromatics. The fascinating sensing characteristics of molecular architectures discussed in this article may enable future development of improved sensors for nitroaromatic explosives.
机译：由于对国家安全及其作为环境污染物的作用的关注，对痕量硝基芳族（NAC）爆炸物的有效感测已成为近来的主要研究重点。含NO2的电子不足的芳族化合物，例如苦味酸（PA），三硝基甲苯（TNT）和二硝基甲苯（DNT），是许多可商购获得的化学炸药的常见成分。在本文中，我们总结了我们在富电子自组装离散分子传感器的合理设计及其在溶液和气相中感测硝基芳烃方面的最新进展。通过金属-配体-配位-键合相互作用，合成了几种富含p-电子的荧光金属环（正方形，矩形和镊子/钳子）和金属带（三角形和四边形棱镜），并具有足够的内部空间来容纳缺电子的硝基芳族化合物在分子水平上通过多个超分子相互作用。这样的相互作用随后即使存在痕量的硝基芳族化合物也导致传感器的可检测的荧光猝灭。本文所讨论的分子结构具有令人着迷的传感特性，可能有助于改进未来的硝基芳族炸药传感器的开发。

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