Synthesis And Properties Of Diarylethene Ion Chemosensor Containing Pyrazole/Quinolines

In recent years,thanks to the advantages of high sensitivity and selectivity,and simple operation,the sensor has stood out among many detection methods and has become the focus of research.The sensor has potential application prospects in food detection,environmental monitoring,biomolecular fluorescence imaging,and medical fields.The sensors are divided into ion sensors,p H sensors,amino acid sensors and so on.With the progress and development of society,a large number of anions and cations already exist in the natural environment,which has a great impact on the natural environment and threatens our health.Therefore,in order to accurately detect these ions,scientists have proposed many methods for detecting ions,such as atomic absorption spectrometry,voltammetry,electrochemical methods,and ion sensors.Among them,ion probe have drawed attention to chemistry researchers due to the advantages,here we focus on ion sensors.Due to the good thermal stability,good fatigue resistance,and good photochromic properties of the diarylene compound,as well as multiple-regulated fluorescent switches and photochemical sensors,the diarylethene molecule has become the most promising photochromic molecule.Ion sensors for arene molecules have become a hot research topic.In this thesis,diarylethene compounds were modified by introducing groups such as pyrazole and quinoline,and four better diarylethylene sensors were synthesized.The structures were characterized by NMR,mass spectrometry,and so on.At the same time,some optics and ion recognition of the compounds were also studied.The contents are as follows:Chapter 1,introducing the characteristics of photochromic and diarylethene compounds,the research progress of chemical sensors,diarene-based chemical sensors,and an introduction to pyrazole/quinoline fluorophores.Then the main content of this paper is presented.Chapter 2,two diarylethene ion sensors DT-1O and DT-2O based on pyrazole group were synthesized.The properties of ion sensor are studied.DT-1O shows obvious optical properties in acetonitrile,the compound DT-1O can selectively used for the detection of ions in water samples.DT-2O can also be used for test strip detection and cell imaging.In chapter 3,two types of diarylene ion probe DT-3O and DT-4O,which were based on quinoline groups,and their properties were also tested.It was found that they have obvious photochromic properties:under the irradiation of ultraviolet light,The solution of DT-3O turns colorless to purple,while the solution of DT-4O turns colorless to blue.Among them,DT-3O can identify Zn²⁺,the other properties of DT-3O with ion are further determined,through the mass spectrometry and nuclear magnetic resonance;DT-4C can be compared in a closed-loop state by colorimetric and fluorescent dual channels.Cu²⁺is specifically identified.