Construction Of Chemical Sensor Based On Diarylethene And Its Application In Two-component Detection

As a classical photochromic system,Diarylethenes have become one of the most promising photoreactive materials due to the advantages of good thermal stability,strong fatigue resistance,fast response time and high quantum yield,and so on.The differences in structure between open-ring state and closed-ring state lead to the great differences in physical and chemical properties,which make they have a wide range of potential applications in optical storage,optical switches,sensors and other fields.On the other hand,diarylethene as an excellent optical control unit,it is connected to functional chemical groups,or the structure of diarylethene molecule itself is changed by chemical modification to construct a chemical sensor with multiple regulatory capabilitiesits unique optical switching characteristics due to its unique optical properties.Based on this,we introduced three different chemical groups,including pyrimidine hydrazine,benzyl carbazate and 4-aminoacridone to modify the parent molecules of diarylethene,and constructed three new diarylethene sensors with different regulatory capabilities.The main research contents are as follows:In chapter one,firstly,the general research situation of chemical sensors were summarized,then the application of diarylethene chemical sensors in metal ion and amino acid sensing were introduced,and finally the design basis and research contents of this paper are presented.In chapter two,diarylethene derivatives DT-1o was synthesized by modifying the parent diarylethene molecule with pyrimidine hydrazine,and its photochromic behavior,ion selective,ultraviolet and fluorescence switching properties were systematically studied.DT-1o exhibited high selectivity and sensitivity to Al³⁺and Zn²⁺in methanol solution.In addition,DT-1o in real water samples for the detection of Al³⁺and Zn²⁺was also studied.In chapter three,diarylethene derivatives DT-2o was synthesized by modifying the parent diarylethene molecule with benzyl carbazate,and the photochromic properties,metal ion selective,ultraviolet and fluorescence switching properties were system investigated.DT-2o not only can be served as a colorimetric sensor for recognition of Cu²⁺by the naked eye,but also acted as a fluorescent sensor for detection of Cd²⁺in THF solution.In addition,the application of DT-2o in actual water samples was also studied.In chapter four,diarylethene derivatives DT-3o was synthesized by modifying the parent diarylethene molecule with 4-amino acridone,and and the photochromic properties,metal ion selective,amino acid selective,ultraviolet and fluorescence switching properties were system investigated.DT-3o exhibited specificity recognition for Cu²⁺and Arg in DMSO solution.It not only can be used as a colorimetric sensor for identification of Cu²⁺by the naked eye,at the same time also can be acted as a colorimetric and fluorescent sensor for dual channel detection Arg,and showed high sensitivity and excellent anti-jamming ability of Cu²⁺and Arg.In addition,the practical application of DT-3o in water sample detection and paper strip were also investigated.