The Synthesis And Recognition Properties Study Of Chemosensors Based On Naphthalimide And Quinoline

Chemosensors have important applications in the field of environmental chemistry,analytical chemistry and life science etc.,therefore,new chemosensors with good specificity,high sensitivity and prompt detection has attracted considerable attention.In this thesis,a series of organic chemosensors molecule L1,L2 and L3 were synthesized based on naphthalimide and quinoline.Specific content can be divided into the following four parts:In chapter 1:Introduction.Firstly,the structure and its recognition mechanism of chemosensors are introduced,then the research progress of chemosensors for hydrogen sulfate,hydrogen sulfite and copper ion are respectively presented.Finally the research subject of this paper is put forward.In chapter 2:The synthesis and recognition properties study of chemosensors L1 for hydrogen sulfate anion based on naphthalimide and quinoline.L1 was studied by fluorescence emission spectrum to explore its recognition ability,the results demonstrated that the chemosensor L1 had high selectivity to hydrogen sulfate,the detection limit(DL)for hydrogen sulfate was calculated to be 7.79×10-7 M.Sensor L1 exhibited a highly sensitive fluorescent response toward HSO4-with an 8-fold fluorescence intensity enhancement under the addition of 10 equivalent of HSO4-in DMSO-H2O(1/1,v/v)solution.The recognition mechanism has been recommended to proceed via a hydrolysis process of the C=N bond.In chapter 3:The synthesis and recognition properties study of chemosensors for hydrogen sulfite anion was conducted in pure water.Design and synthesis a new chemosensor L2 was based on quinoline and benzothiazole.Identification capability of sensor L2 was studied by the naked eye identification,UV-vis absorption spectrum and fluorescence emission spectrum in the water phase,the results showed that L2 for hydrogen sulfite anion had a high selectivity etc,achieving the effect of the naked eye identification.Sensor L2 provided the basis to rapidly detect hydrogen sulfite anion in biological environment.In chapter 4:The synthesis and recognition properties study of chemosensors L3 for copper ion based on naphthalimide and coumarin.The spectral properties of the molecule were studied by UV-vis absorption spectrum and fluorescence emission spectrum,which revealed that the maximum absorption wavelength had the obvious enhancement and the system of the fluorescence intensity quenched when the 10 equivalent of copper ion was added to the solution of sensor L3 in DMSO-H2O(1/1,v/v).However,when adding the other ions,the maximum absorption wavelength and the maximum fluorescence intensity did not show any change.The sensor L3 identified copper ion by complexing,the detection limit(DL)for copper ion was calculated to be 7.73×10-6 mol·L-1.