Fluorescence,Dye Adsorption And Magnetic Properties Of Coordination Polymers Constructed By Semi-rigid Pyrazolecarboxylic Acid Ligands

In the research field of coordination chemistry,the research on coordination polymer/CPs or metal-organic framework compounds/MOFs rhas made qualitative progress with the development of science and technology.The complex's structure is infinitely possible due to the influence of ligands,metal ions,solvents,temperatures and other factors,making it possible to carry out weightlifting in the fields of light,electricity,magnetism,adsorption,catalysis and biomedicine.In the process of constructing complexes,it is always the goal of researchers to achieve the target complex by controlling various factors.In this paper,we use an asymmetric semi-rigid 1-?3,5-dicarboxylatobenzyl?-3,5-pyrazole dicarboxylic acid?H₄L? ligand for the construction of complexes,than combined with a series of metal ions with solvothermal reaction,nine CPs were obtained:[Ln?HL??H₂O?₃]_n?1-Ln??1-3??Ln=Eu?1?,Tb?2?andDy?3??,{[Cd₃?HL?₂?H₂O?₃]·3H₂O·2CH₃CN}_n?4?,{[Zn₃?HL?₂H₂O]·4H₂O}_n?5?,{[Ba₂L₅H₂O]·2H₂O}_n?6?,{[Ba₄?L?₂·5H₂O]·2H₂O}_n?7?,{[Cd₃?HL?₂·Cl₂·2H₂O]·2H₂O}_n?8?and{[Cu₂?L?₂·2H₂O]·4H₂O}_n?9?.The complexes,were characterized by thermogravimetry,infrared,X-ray powder diffraction,ultraviolet and ICP,in addition,the performance of the relevant complexes were studied emphasizedly:The first chapter introduces the basic development of the CPs and the application field,as well as the purpose of the topic,the main achievements and the main work.In the second chapter,the CPs 1-3 were obtained by reacting ligand H₄L and lanthanoid metals Eu³⁺,Tb³⁺and Dy³⁺.The complexes 1?Eu?and 3?Dy?exhibit good fluorescence properties and antiferromagnetic effects,especially the complex 1?Eu?,not only has the ability to recognize Fe³⁺,CrO₄^2- and Cr₂O₇^2- ions,but also has excellent water stability.This provides the potential for practical application of CPs.In the third chapter,complex 4?Cd? with 3D pore structure was synthesized by using ligand H₄L and metal Cd²⁺.The complex exhibits excellent solid-state fluorescence properties.Due to its pore structure,it exhibits good selective adsorption capacity for Congo Red/CV dye.In the fourth chapter,five complexes 5?Zn?,6?Ba?,7?Ba?,8?Cd?,9?Cu?were obtained by reacting ligand H₄L with metals Zn²⁺,Ba²⁺,Cd²⁺and Cu²⁺and their structures and related performance were studied.Especially,complex 5?Zn?exhibited good solid-state luminescence properties,and complex 9?Cu?exhibited antiferromagnetic exchange properties.