Development Of Quinolinyl Hydrazone Colorimetric Fluorescence Sensor And Ion-specific Functional Materials

With the overall development of supramolecular chemistry,fluorescent chemical sensors have become a popular choice for researchers.Fluorescence chemical sensors are mainly of important value in new materials and new energy sources.The detection conditions used to be organic solvents but can also be detected in water.The original detection of molecules or ions in the environment is also often used.Detection of molecules or ions in organisms.Quinoline and its derivatives have dual functions of fluorescence and recognition due to their special structure.Therefore,they are widely used in the research of fluorescent chemical sensors.After a series of chemical modifications,the combination with ions will show obvious changes in ultraviolet or fluorescence spectra.,Some fluorescence sensors can even achieve naked eye detection,improving detection efficiency.Schiff bases have significant advantages such as flexible synthesis and strong coordination with metal ions.The Schiff base structure is introduced into quinoline derivatives to play a better role in selective recognition.In this research,a series of fluorescent chemical sensors were designed and synthesized based on 8-hydroxyquinoline,and their detection capabilities were investigated respectively,and they were characterized by infrared spectroscopy,and hydrogen nuclear magnetic resonance spectroscopy.It can specifically recognize metal ions.The main content of the paper is as follows:The thesis mainly includes five parts:The first part briefly introduce the development history of supramolecular chemistry,the composition,recognition mechanism and representative research of fluorescent chemical sensors,the research progress of different types of quinoline fluorescent chemical sensors,and provide research and design ideas for this topic.The second part,the structure of naphthalene ring was successfully introduced based on 8-hydroxyquinoline and ethyl bromoacetate,a new colorimetric fluorescent chemical sensor（L1）was designed and synthesized,to make it selectively recognize metal ions.L1 can specifically recognize Fe³⁺in DMSO/H₂O（3:2V/V）,The detection limit of L1 for Fe³⁺was 9.63×10^-6,It’s very sensitive.The third part,a Novel Colorimetric Fluorescent Chemical Sensor（L2）Based on 8-Hydroxy Quinoline and Ethyl Bromoacetate,it selectively recognizes metal ions in aqueous media,intermolecularπ-πinteractions are formed between adjacent molecules,L2 can specifically recognize Al³⁺in DMSO/H₂O（3:2V/V）,Al³⁺can be recognized naked eye under fluorescent irradiation.And its minimum detection limit is 2.9×10^-7M,far below international standards.Other metal ions such as(Hg²⁺,Ag⁺,Cd²⁺,Cr³⁺,Mg²⁺,Ca²⁺,Cu²⁺,Fe³⁺,Co²⁺,Ni²⁺,Pb²⁺,Zn²⁺,Ba²⁺,etc.)do not interfere with the recognition of Al³⁺.The fourth part,a novel colorimetric fluorescent chemical sensor（L3）with phenol structure was successfully introduced based on8-hydroxyquinoline and ethyl bromoacetate to selectively recognize Hg²⁺in aqueous medium.The detection limit of L3 in DMSO/H₂O was 1.26×10^-7M,far below international standards.Other metal ions such as(Ag⁺,Cd²⁺,Cr³⁺,Mg²⁺,Al³⁺,Ca²⁺,Cu²⁺,Fe³⁺,Co²⁺,Ni²⁺,Pb²⁺,Zn²⁺,etc.)do not interfere with the recognition of Hg²⁺.The fifth part,the research of this paper is summarized and prospected.