Precise recognition of Fe³⁺ in a biological system and ecological environment is of great importance. Therefore, a new phenanthroimidazole based chemosensor SP (H₂ saldien-substituted phenanthroimidazole) was designed, fabricated and evaluated as a facile fluorogenic “OFF-ON” type chemosensor toward Fe³⁺ in aqueous solution. The SP could sensitively and selectively recognize Fe³⁺ with a limit of detection of 0.36 µM. The sensing mechanism for the SP-Fe³⁺ system was successfully proven on FT-IR spectroscopy, TOF-MS and the calculations of DFT (density functional theory). It is found that the SP could be basically recycled through treating with EDTA. Moreover, Fe³⁺ can be visualized by prepared SP in the test kit and low-cost smartphone sensor applications. Evidently, the experiments manifested that the prepared SP was capable of recognizing of Fe³⁺ in aqueous media.

在生物系统和生态环境中准确识别Fe ³⁺至关重要。因此，设计，制造并评估了一种新的基于菲并咪唑的化学传感器SP（H ₂取代的菲并咪唑），作为一种简便的针对水溶液中Fe ^3+的荧光“ OFF-ON”型化学传感器。的SP可以敏感和选择性识别的Fe ³⁺与检测0.36μM的的限制。SP -Fe ³⁺系统的传感机理已通过FT-IR光谱，TOF-MS和DFT（密度泛函理论）的计算得到了成功证明。发现SP基本上可以通过EDTA处理回收。此外，Fe ³⁺可以通过在测试套件和低成本智能手机传感器应用中准备的SP进行可视化。显然，实验表明，所制备的SP能够识别水性介质中的Fe ³⁺。