Synthesis, Characterization And Properties Of New Chemical Sensors Possessing Fluorescent/Electrochemical Signal Response

Molecular recognition is the core content of supramolecular chemistry. In recent years, with a better understanding of the importance of the various types of ions in body life and environment, researchers focus on the field of ion recognition greatly, especially for those cations and anions which play an important role in human body. The fluorescent chemical method has the advantages of convenience, high sensitivity, simple instrumentation and it is easy to be operated, so a lot of chemical sensors take the fluorescence change as the output signal. Ferrocene group is a parent compound with excellent electrical properties, it is widely used in organic synthesis because of the unique spatial structure, excellent redox performance, chemical stability, and it is easy to be modified. When the ferrocene group is connected with some special organic conjugated system which have some certain functions, it can generate lots of derivatives that possess rich optical and electrical properties. We synthesized a series of receptor molecules with different functional groups which possess certain optical and electrical properties, and we take a detailed study of the coordination properties of these compounds with cations and anions using the methods of UV-visible absorption spectroscopy, fluorescence spectroscopy, and electrochemical testing, and we get some meaningful results.1. Synthesis and properties of the chemical sensors for cations based on ferrocene-triazole groups:In this chapter, we prepared three compounds L1-L3 based on ferrocene group via "Click" reactions, and we characterize its structure, optical and electrical properties. The results showed that L1, L2 had a good response to Hg2+, L3 only showed specific fluorescence enhancement response to Zn2+.2. Synthesis and properties research of the colorimetric sensors for F" based on terpyridine groups:In this chapter, we synthesized three colorimetric sensors for F-based on terpyridine fluorophore L4-L6. We take an anion titration via UV-visible absorption spectroscopy and fluorescence emission spectra. The results showed that all the three sensors had good response to F" which can be identified by naked eyes, the sensitivity order is L5> L6> L4.3. Synthesis and properties of schiff base compounds based on the anthraquinone fluorophores:In this chapter, we synthesized a schiff base compounds L7 based on anthraquinone fluorophores. We studied its optical properties via UV-visible spectra and fluorescence spectra. The results showed that L7 had a fluorescence quenching response only for Cu2+, it is a potential fluorescent probe molecule for Cu2+.