Synthesis And Sensing Properties Of Coumarin-based Cationic Fluorescent Chemical Sensors

Cationic fluorescent chemical sensor, as a possible means to replace the traditional heavy metal ion detection, has been concerned by its many advantages such as low cost,rapid detection, and easy operation. Among them, coumarin-based cationic fluorescent chemical sensor has been focused in recent studies. In this paper, 4 coumarin-based cationic fluorescent chemical sensors（disulfide cyclopentadiene-based A, B and schiff base-based C, D） has been synthesized. There sensing properties has also studied.The molecular structure and sensing properties of this 4 coumarin-based cationic fluorescent chemical sensors has been characterized. The molecular structure of the products we synthesis are as expected. They all be able to achieve the quantitative detection of different metal ions by fluorescence spectra titration. Among them, A and B can selective quantitative detection to Cu²⁺. C can selective quantitative detection to Cr³⁺and D can selective quantitative detection to Cd²⁺. A significant color change can be observed when response occurs between B and Cu²⁺, which rapid qualitative detection can be achieved by naked eyes. A fluorescence enhancement can be observed when response occurs between D and Cd²⁺. The complex ratio between B, C, D and their respective metal ions are 1:1, which confirmed by Job’s Plot. This sensors provides good performance of recognition. It is expected to become a new potential solution in detection of heavy metal ions.