Synthesis And Optical Properties Of Ln-MOFs (Ln=Eu,Tb)

The rare earth element has important research significance in the field of chemistry, and it is a huge and rich treasury of luminescent material. The electronic configuration of rare earth atoms in the presence of 4f orbitals, 4f electrons emit different wavelengths of light from a high energy level to a low energy level, so that the rare earth compounds have unique luminescent properties. In this paper, we mainly make focus on the systematic research work about the synthesis of novel rare earth compounds, the preparation of new nanometer materials, the characterization of basic property and the application of fluorescence sensing detection. Specific work is as follows:?1? In the hydrothermal synthesis conditions, used two rare earth ions Eu³⁺ and Tb³⁺ as well as transition metal ions Cd²⁺ to combine with two kinds of organic ligands, center for the flexible chain of carboxylic acid ligand was tetrakis [4-?carboxyphenyl?oxamethyl]methane acid?H4L? and rigid carboxylic acid ligand was 4,4',4''-?methylsilanetriyl?tribenzoic acid?H₃L?, then the three compounds with the novel structures were obtained, which was TbL[H₂NMe₂] ? [EuL?H₂O?₂]·2DMA and [Cd₃?L?₂?H₂O?₆]·1.5DMF, and the new nanometer material was made from the TbL compounds.?2? The crystal structure of the prepared compounds was analyzed systematically by X ray single crystal diffraction, and the basic properties of the obtained compounds were characterized by X ray powder diffraction, thermogravimetric analysis and infrared analysis et al, then three kinds of multifunctional luminescent materials were used to detect the fluorescence sensing effect in the solution of different cations, ations, and organic solvents, experimental results showed that the three compounds all has excellent fluorescence performance and fluorescence sensing effect.