Synthesis Of Nitrogen-Metal-Organic Frameworks With Rich Electron And Their Fluorescence Sensing Properties

This paper revolves around the field of metal-organic frameworks for fluorescence sensing,using electron-rich nitrogen and pincer ligands and transition metals[Cu（I）,Cd（II）,Cu（II）,Ni（II）],some luminescent metal organic frameworks were designed and synthesized,and the application of these complexes in the detection of nitro explosives,metal cations and anions was investigated in depth.1.A new structure of LMOFs（1）was synthesized by solvothermal method and cadmium nitrate with 4,4-dipyridyldiphenyl ether as the main ligand and1,4-cyclohexanedioic acid as the auxiliary ligand.A new structure of LMOFs（2）was synthesized by diffusion method using 4,4-dipyridyldiphenyl ether and cuprous iodide.It was found that complex 1 has strong fluorescence in DMF and can detect TNP as well as iron and silver ions with high sensitivity and selectivity in DMF solution.And has a very good circulation.Complex 2 can detect TNP well in acetonitrile solution.And in the methanol solution,Al³⁺can be detected in a targeted manner and visible to the naked eye and meet the relevant regulations of the World Health Organization.And the related mechanism has been deeply studied and discussed.2.Using two kinds of pincer-based polydentate ligands as raw materials,and copper nitrate,nickel nitrate and cadmium nitrate,three kinds of metal organic frameworks 3,4,5 were synthesized by solvothermal method,and the fluorescence properties of 5 were obtained.Were studied.It was found that 5 has good stability in water and can adapt to changes in pH and temperature,and can efficiently detect TNP and iron ions in an aqueous solution,and has a very low detection limit.3.A three-dimensional structured luminescent metal organic framework 6 was synthesized by a solvothermal method using an electron-rich pincer-based ligand containing an amide bond as a raw material and a transition metal element Cd having a d¹00 structure.The fluorescence properties of complex 6 were tested.It was found that 6 has a good detection effect on TNP,Cu²⁺and MnO₄^-in the aqueous solution.Figure[79]Table[11]Reference[101]...