AbstractDiethyl chlorophosphate (DCP), an organophosphate, is utilized as a pesticide, herbicide, and for various other applications. Despite many uses of organophosphates, the organophosphates are noxious and harmful substances, and their selective detection is a critical concern in the context of the environment, physiology, and social security. In a methodological quest, here we have synthesized two Schiff base compounds 1 and 2 by introducing the hydroxyl group at the α‐position of 3‐pyrrolyl BODIPY either directly as hydroxylamine 1 or at the ortho position of aryl ring as 2‐aminophenol 2. Both compounds 1 and 2 exhibited high selectivity and high sensitivity for DCP over other pesticides in the aqueous‐alcoholic medium at physiological pH. This occurs via nucleophilic phosphorylation of the hydroxyl group, which resulted in both compounds exhibiting two different optical signals following the structure‐function correlation of the pyrrolyl BODIPY systems. Upon binding DCP, compound 1 showed a quenching in the optical spectrum because of phosphorylation of hydroxyl group whereas compound 2 exhibited enhancements in both absorption and fluorescence spectra because of hydroxyl phosphorylation followed by intramolecular cyclization. Furthermore, the fluorescent microscopy experiments also indicated that the compound could be used as a fluorescent compound for sensing DCP in plant tissues.
摘要 氯磷酸二乙酯(DCP)是一种有机磷酸酯,被用作杀虫剂、除草剂和其他多种用途。尽管有机磷的用途很多,但有机磷是有毒有害物质,其选择性检测是环境、生理和社会安全的关键问题。在方法学的探索中,我们通过在 3-吡咯基 BODIPY 的 α 位直接引入羟基(羟胺 1)或在芳基环的正交位引入羟基(2-氨基苯酚 2),合成了两种希夫碱化合物 1 和 2。在生理 pH 值的水醇介质中,化合物 1 和 2 对二氯丙醇的选择性和灵敏度均高于对其他农药的选择性和灵敏度。这是因为羟基发生了亲核磷酸化反应,从而导致这两种化合物按照吡咯基 BODIPY 系统的结构-功能相关性显示出两种不同的光学信号。结合二氯丙醇后,化合物 1 因羟基磷酸化而出现光谱淬灭,而化合物 2 则因羟基磷酸化后的分子内环化而出现吸收和荧光光谱增强。此外,荧光显微镜实验还表明,该化合物可用作感知植物组织中二氯丙醇的荧光化合物。