Synthesis And Properties Of Diarylethene-based Fluorescent Sensors With A Quinoline Unit

Diarylethene compound has been widely studied in optical memory,logic circuits,and chemical sensors due to their excellent thermal stability,significant fatigue resistance and light sensitivity.With the development of biotechnology,design and investigation of chemosensors based on diarylethenes are also of considerable interest.Currently,the strategy of combination the diarylethene unit with a functional groups for optimization and modulation of a particular nature has become one of the main ways to design chemosensors.Therefore,six new molecular structures have been designed based on the above ideas and investigate the photochemical properties and metal ion recognition.The main content of this paper summarized as follows:Two diarylethene based on 8-hydroxyquinoline unit and four diarylethene based on8-carboxamidoquinoline were synthesized.Their photochemical properties was investigated systematically,the main contents are as follows:In chapter 1,the research background,application and properties were reviewed.Based on introduction of their application in fluorescent switch and ion recognition,The target of our research was brought out.In chapter 2,Two diarylethene based on 8-hydroxyquinoline unit were synthesized,and the multi-responsive photoswitching property of DTE-1² induced by light,and ions was investigated.Based on the changes in the fluorescence of 1O and absorption spectra of 1O?induced by the addition of various metal ions,we can selectively discriminate Cu²⁺from Cd²⁺.Upon addition of Zn²⁺and Cd²⁺to DTE-2,the fluorescence intensity of diarylethene DTE-1 was enhanced obviously.DTE-2could serve as a fluorescence sensor for the recognition of Zn²⁺and Cd²⁺.In chapter 3,Two diarylethene based on 8-carboxamidoquinoline unit were synthesized,and the multi-responsive photoswitching property of DTE-3⁴ induced by light,and ions was investigated.As a result,the diarylethene DTE-3 could be used as a good selective and sensitive fluorescence sensor for Zn²⁺ion.Diarylethene dimers DTE-4 could be used as a good selective fluorescence sensor for Zn²⁺and Cu²⁺ion,the fluorescence could be observed with naked eyes after illumination under UV light.In chapter 4,Two diarylethene based on bi-8-hydroxyquinoline unit were synthesized,and the multi-responsive photoswitching property of DTE-5⁶ was investigated and they showed good photochromism in acetonitrile.DTE-5 and DTE-6 can be used as a dual-control fluorescent molecules switch by Zn²⁺and optical.A logic circuit had been designed and successfully constructed with inputs of light and chemicals and the output of fluorescence at 513 nm.