Preparation Of Metal-Organic Frameworks Containing Fluorine,Iodine Ligands And Study On Their Properties

Metal-Organic Frameworks?MOFs?are a class of coordination polymeric materials with great application potential in the fields of gas adsorption and separation,luminescence as well as chemical catalysis.In this thesis,various organic ligands have been synthesized,MOFs crystals contain fluorine or iodine were prepared by using ligands and mental salt.The crystal structure data were analyzed by X-ray diffraction.Some MOFs with three-dimensional structure were selected to study the adsorption properties.In this thesis,a series of organic ligands for the preparation of MOFs were synthesized by converting the amino groups on the organic ligand precursor into triazole groups.Five kinds of triazolopyridine ligands with different substituents were prepared.Six kinds of MOFs were synthesized by using three kinds of ligands and two kinds of silver salts under the same heating process.The adsorption properties of two kinds of MOFs for organic dyes were investigated.In addition,organic linkers containing iodine were prepared,three kinds of MOFs with one-dimensional structure,three-dimensional structure and one-dimensional cross structure were synthesized by using copper salt and manganese salt.The iodide ions which were not added in the reaction were found in the one-dimensional structure of some MOFs crystals,and it was considered that the iodine ions were formed by the fracture of the carbon-iodine bond on the organic ligands.In this thesis,MOFs with [Cu₈] cluster structure was prepared by using copper tetrafluoroborate.It is found that the iodine group on the ligand disappear and participate in construction of metal cluster structure.In order to verify the phenomenon,using ligands without iodine to react with copper tetrafluoroborate and adding organic compounds containing iodine,a similar MOFs with [Cu₈] cluster structure was constructed.In addition,eight kinds of zerodimensional complexes were prepared by using organic ligands containing fluorine or iodine and transition metal salts,which can be used as a reference for the synthesis of MOFs in the future.In summary,a total of 12 organic ligands were synthesized,including fluorinecontaining,iodine-containing and other structures organic ligands.11 kinds of MOFs which contain fluorine or iodine were prepared.A method for preparing Cu₈ metal clusters was proposed.The influence of anion and ligand substituent on the structure of MOFs is discussed.This dissertation has certain significance for the preparation of MOFs.Two kinds of fluorine-containing MOFs were selected to explore their adsorption properties for organic dyes and heavy metal ions,and had good adsorption effects on Congo red,methyl orange and permanganate ions.