Study On The Constructions And Properties Of Coordination Polymers Based On 2-(1H-tetrazol-5-yl) Terephthalic Acid Ligand

Coordination polymers（CPs）refer to a class of crystalline materials that connect metal ions or clusters with organic ligands to form 1D,2D,or 3D infinite networks.Metal-organic frameworks（MOFs）are a new class of hybrid porous materials and formed by linking metal ions or metal clusters through organic frameworks.Due to their high specific surface area,abundant pore structure,tunable morphology,and versatility,MOFs are regarded as important candidates for numerous emerging applications,such as gas storage,sensing,energy storage,adsorption,and catalysis,etc.In this article,a rigid2-（1H-tetrazol-5-yl）terephthalic acid（H₂L）organic ligand and auxiliary ligand1,10-phenanthroline were selected to react with rare earth metal ions and transition metal ions to form 6 different MOFs under solvothermal reaction conditions,respectively.After the corresponding characterization,we investigate their associated performance.The research content of the thesis is mainly divided into the following four chapters:Chapter 1 gives a brief introduction to CPs.The structure design,construction methods and characteristics of the complexes are introduced,and their main applications are described.This chapter also explains the topic selection and research progress of the thesis.In chapter 2,a series of novel one-dimensional isostructural lanthanide metal-organic frameworks（Ln-MOFs）{[Ln（L）（H₂O）₅]·2H₂O}_n were synthesized based on the above-mentioned ligands H₂L and Ln（III）ions.(Ln=Tb（1）,Dy（2）Eu（3）and Eu_xTb_1-x).Notably,different ratios of Eu（III）and Tb（III）can be combined into the same Ln-MOFs,resulting in the formation of many new MOFs Eu_xTb_1-x with different ratios.Under the same excitation wavelength,double emission peaks of Eu（III）and Tb（III）are generated,and the doping material realizes a smooth change from yellow-green,yellow,orange,and then red.Studies have shown that 1 is an excellent reusable luminescent probe for the detection of dimethylimidazole（DMZ）,metronidazole（MDZ）or tetracycline hydrate（TET）in aqueous solutions with detection limits of up to 41.90,86.48 and 20.30 ppm,respectively.In addition,the magnetic measurements also show that 2 has a slow magnetic relaxation characteristic.In chapter 3,a 3D network framework complex[Cu（L）]_n（4）was synthesized by solvothermal method based on the above ligands H₂L and Cu（II）ions,The auxiliary ligands 1,10-phen was introduced under similar conditions,we synthesized a 1D chain complex{[Cu（L）（phen）]·H₂O}_n（5）.The catalytic performance of 4 for CO₂ cycloaddition reaction was systematically studied,showing a high catalytic efficiency,the highest for epibromopropane reaching 96.30%.Additionally,magnetic studies have shown that 4 also exhibits general antiferromagnetic interactions.In chapter 4,a new 3D network porous material{[Zn₂L（OH）（H₂O）]·H₂O}_n（6）was constructed by the ligands H₂L and Zn（II）ions.6 exhibited great solid-state fluorescence properties,and at the same time,we carried out a detailed study on its dye adsorption properties.Experiments show that 6 exhibits obvious selective adsorption to Congo red（CR）,and the value of Q_eq can reach 8.211 mg/g at equilibrium.