Study On Luminescence And Catalytic Properties Of Metal Organic Framework Materials

Metal organic frameworks?MOFs?are a class of microporous crystalline materials with novel structure and excellent performance.Compared with the traditional inorganic porous materials,they have the advantages of mild synthesis,definite structure and designable function.In recent years,various structures of MOFs have been designed and related performance studies have been performed.Here,we have discussed the fluorescence properties of lanthanides MOFs?Ln-MOFs?and the catalytic properties of POM@MOFs.1.We prepared a Ln-MOF [Eu?BTPCA??H₂O?]·2DMF·3H₂O?Eu-BTPCA H₃BTPCA=1,1?,1?-?benzene-1,3,5-triyl?tripiperidine-4-carboxylic acid?under solvothermal conditions.The structure is formed by connecting a 1D chain of lanthanide with organic ligand,and has two types of channels in the direction of c axis.The ligand BTPCA is an aromatic carboxylic acid compound containing nitrogen heterocyclic and shows good light absorption properties in the UV region.Under the sensitization of the ligand,the luminescent properties of Eu³⁺are significantly enhanced,and the "antenna effect" from the ligand to the lanthanide occurs.The mechanism of the ligand sensitized lanthanideluminescence is discussed in detail.Considering that the structure of Eu-BTPCA contains many Lewis base sites pointing to inside of the channel,it can interact with metal ions,and has good structural stability in various solvents.We studied its sensing effect on metal ions and made a detailed explanation of the sensing mechanism.2.We prepared a POM@MOF under hydrothermal condition,named NENU-3([Cu₂?BTC?_4/3?H₂O?₂]₆[HPW₁₂O₄₀]·(C₄H₁₂N)₂·25H₂O)?H₃BTC=1,3,5-benzenetricarboxylic acid?).There are two types of octahedral cages arranged alternately,and the [PW₁₂O₄₀]^3-occupies one cage as guest.In view of its good structural stability,definite porous structure,simple and repeatable synthesis method and wide applications in catalysis,we have carried out profound research on the porosity and stability through a variety of characterization methods,and studied its catalytic activity for the hydrolysis of ethyl acetate.