Chromogenic probe with oxidized bis-indolyl scaffold has been synthesized for the detection of a nerve gas mimicking agent, DCNP (diethyl cyanophosphonate) at pH 8.0 in water. The mechanism of interaction was proposed as the release of cyanide ion through the indole group mediating the hydrolysis of phosphorous-hetero atom bond and, thereafter, the Michael addition of the liberated CN⁻ ion to the electron deficient CC bond of the bis-indolyl moiety. The reaction featured a remarkable change in color from red to colorless at ambient condition. Then, low-cost and portable paper strips were designed for a rapid and on-site vapor phase detection of DCNP without involving any sophisticated instrument or skilled personnel. Finally, a dye assembled inorganic nanocomposite material was devised to achieve a more sensitive ‘turn-on’ detection of DCNP in water.

中文翻译：

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使用化学修饰的纸条和染料组装的无机纳米复合材料视觉检测神经毒剂模拟物†

已合成具有氧化双吲哚基支架的发色探针，用于检测水中pH值为8.0的神经毒气模拟剂DCNP（氰基膦酸二乙酯）。相互作用的机理，提出了作为氰离子的通过吲哚基团介导的磷-杂原子键的水解释放，此后，迈克尔加成释放的CN的^-离子中的缺电子Ç双吲哚基部分的C键。该反应的特征是在环境条件下颜色从红色显着变为无色。然后，设计了低成本，轻便的纸带，无需任何复杂的仪器或熟练人员即可快速现场进行DCNP气相检测。最后，设计了一种染料组装的无机纳米复合材料，以实现对水中DCNP的更灵敏的“开启”检测。