The Synthesis Of Benzocoumarin And Quinoline Schiff Bases And Its Application As Probes For Detecting Multiple Ions

In this paper,three fluorescent probes for the detection of multiple ions have been synthesized based on benzocoumarin and quinoline derivatives.By means of different methods,they accomplished the detection of multiple ions with a single probe.This paper consisted of following four parts:In the first chapter,we made a brief summary of the basic knowledge of fluorescent probes and had a brief introduction of quinoline and coumarin derivatives.Moreover,we briefly reviewed the research status of various anion and cation probes.In the second chapter,2’-hydroxynaphthalene-1’-methylidene-5,6-benzocoumarin-3-imine（L_a）was synthesized based on benzocoumarin.L_a could selectively recognize Zn²⁺in acetonitrile through fluorescence enhancement,which could be explained by the mechanism of PET and C=N isomerization.L_a could selectively recognize Cu²⁺and S^2-in the ethanol/water（9:1,V/V）system through fluorescence quenching and fluorescence recovery,which might be related to the paramagnetism of Cu²⁺and the extremely low K_sp of Cu S,respectively.In the third chapter,pyridine-2-aldehyde-（5’,6’-benzocoumarin-3’-carbonyl）hydrazine（L_b）was synthesized based on benzocoumarin.The solvent could affect the fluorescence properties of the ligand.L_b could selectively recognize Cd²⁺in methanol through fluorescence enhancement.After changing the solvent to ethanol,it could selectively recognize Zn²⁺through fluorescence enhancement.The recognition of Cd²⁺and Zn²⁺was based on PET mechanism.In the fourth chapter,2-hydroxynaphthalene-1-aldehyde-（8’-hydroxyquinoline-2’-carbonyl）hydrazine（L_c）was synthesized based on quinoline.L_c could selectively recognize Al³⁺in ethanol through fluorescence enhancement,which could be explained by the mechanism of PET.L_ccould selectively identify Cu²⁺in DMSO by colorimetric method,and the color difference after adding Cu²⁺to L_c could be observed with the naked eye.