The Properities Of The Functional Coodination Polymers Based On N-heterocyclic Carboxylic Acid Ligands

Metal-organic frameworks（MOFs）,also known as coordination polymers,are one of the porous materials that have sprung up in recent years.Its structure can be simply summarized as follows:the metal nodes are connected with organic node.MOFs are developing faster and faster,and have become one of the fastest modules in the field of chemistry.And its development must all be attributed to its own unique attributes,namely a variety of structures and easily adjustable functions.Nitrogen-containing heterocyclic carboxylic acid ligands have strong coordination ability,flexible coordination mode,and are easy to realize the controllable assembly of coordination polymers with different structures by changing the experimental conditions.Therefore,much attention has been paid to the structure and properties of coordination polymers constructed by these ligands.The addition of auxiliary ligands further enriches the structural types of coordination polymers.In this thesis,we selected two ligands:4-（1,3-diazol-1-yl）isophthalic acid（ligand 1）and 4-（1,3,5-triazol-1-yl）isophthalic acid（ligand 2）.The spatial configurations of seven cases of MOFs and their performance in fluorescence recognition and magnetic properties were explored in detail.The specific research contents are as follows:The first chapter briefly describes the history of coordination chemistry,and summarizes the design and synthesis of functional coordination compounds and the current research status.At last,content contains the importance and research progress of this thesis.In the second chapter,three three-dimensional isomorphic complexes were obtained by solvothermal reaction of Rare-Earth metals with organic ligand 4-（1,3-diazol-1-yl）isophthalic acid.Complex 1 and 2 have fluorescence properties.Complex 1 can be used not only as an excellent fluorescent probe for the detection of nitrobenzene,but also as a highly sensitive fluorescent probe for the detection of Fe³⁺in solution.In addition,the magnetic properties of complex 3 were also tested and characterized.The experimental results show that there is a weak ferromagnetic interaction between the adjacent Dy（III）ions in 3.In the third chapter,on the basis of ligand 4-（1,3,5-triazol-1-yl）isophthalic acid and[Cu（II）]and adding different auxiliary ligands[bpa=1,2-di（pyridine-4-yl）ethane,bpe=（E）-1,2-di（pyridin-4-yl）ethene,4,4’-bpy=4,4′-bipyridine,2,2’-bpy=2,2′-bipyridine],we have constructed four complexes 4-7 with magnetic properties and then compared their structural differences.