Complexes Based On Derivatives Of Sulfides And Carboxylic Acids:Synthesis,Structure And Application

As a new type of porous crystalline materials,metal organic framework materials have received extensive attention due to their structural diversity and excellent performance.The spatial configuration of thioether ligands has plasticity,and carboxylic acid ligands have multiple coordination modes.The combination of two types of ligands can design and synthesize complexes with different structures and properties.Therefore,six coordination polymers were obtained using thioether pyridine ligand 1,2-Bis[(pyridin-4-ylthio)methyl]-benzene(bpb),Zn^?and Cd^?,and four carboxylic acids with different structures under solvothermal conditions.We have characterized and analyzed the structure of these complexes by X-ray crystal eanalyze and discuss the structure of the complexes,the complexes were characterized by X-ray powder diffraction(PXRD),infrared spectroscopy,thermogravimetry and ultraviolet-visible spectroscopy etc.We also studied the photocatalysis and fluorescence properties of the complexes.The main contents of this article are as follows:1,Under solvothermal conditions,we use bpb,2,5-thiophene dicarboxylic acid(2,5-tda),and Cd²⁺ions to get complexes 1([Cd(bpb)(2,5-tda)(H₂O)]_n),1 is a two-dimensional network structure;Complex 2([Zn(bpb)(MeOip^2-)]_n)is synthesized from bpb,5-methoxyisophthalic acid and Zn²⁺metal ion,the complexe is one-dimensional chain;Complex 3([Cd(bpb)(pta)]_n)and 4([Cd_2.5(bpb)(pta)2·O]_n)is synthesized by bpb,phthalic acid(pta)and Cd^?ion,3 is one-dimensional chain structure;however,4 is a two-dimensional network structure.Complex 1 can be used as a photocatalyst for methylene blue,which can degrade 90%of methylene blue within an hour;complex 2-4 can be used as fluorescent probes to detect Fe³⁺and CrO₄^2-,especially MOF 2 can visually recognize S^2-.2,Complex5({[Zn(bpb)(2,5-fda)·H₂O]·DMF·H₂O}_n)and6 ({[Zn(bpb)(2,5-tda)·H₂O]·DMF}_n)are synthesized from bpb,Zn²⁺ion,2,5-furandicarboxylic acid(2,5-fda)and 2,5-thiophene dicarboxylic acid,5 and 6 are two-dimensional structure.Fluorescence data analysis shows the crystal fluorescence spectra of the complexes 5 and 6 indicate that there are dual fluorescence channels based on ligand emission and inter-chain exciton emission in these complex,and the fluorescence direction of the mechanical complex to the fluorescence of the complex is studied,emission peak intensity weakened.