Synthesis And Structure Of Metal Organic Frame Compounds NH - UIO-66 And Eu / Zr-MOFs And Their Fluorescence Sensing To Organic Small Molecules And F ^- Ions

Nowadays, the detection and government of environmental pollutions is becoming the focus of social attention. Metal- Organic Framework Compounds(MOFs) as a new type of functional material has a stable micro porous structure of inorganic metal ions combined with polydentate organic ligands, which has a large specific surface area, controllable skeleton topology /geometry and adjustable pore group shows the application prospect in the field of catalysis, gas storage and separation, chromatography and molecular recognition. In this paper, it mainly about the design and synthesis of MOFs which have fluorescence properties, combining the fluorescence properties and structural characteristics, by adjusting the MOFs’ micro porous structure, organic functional groups and metal positions which are acted as skeleton nodes, in order to adsorb/immobilize/concentrate/identify the small organic molecules and F- ions in environment. The study of the change of fluorescence properties caused by the interaction between the MOFs and small molecule and Fions which are harmful to the environment and the research of how to improve the detection sensitivity and selectivity, can establishes the quantitative relationship between the concentration of pollutions and MOFs fluorescence performance parameters, fulfills the public interest in environmental indicators of high sensitivity,selectivity and real-time rapid determination, has important theoretical significance and application value.In this paper,we synthesized NH2-UIO-66 and Eu/Zr-MOFs by the method of solvent thermal method,then researched on characterization and fluorescence sensing.Main works are:1. Synthesized NH2-UIO-66 and Eu/Zr-MOFs by the method of solvent thermal method,used XRD、FTIR、XPS、PL to analyze them, results show NH2-UIO-66 and Eu/Zr-MOFs has good thermal stability and chemical stability, and can emits strong fluorescence, can be used as a fluorescent sensing material.2. NH2-UIO-66 and Eu/Zr-MOFs respectively through ligand fluorescence spectrometry analysis, preliminary get that the luminescence mechanism of NH2-UIO-66 is based on the luminescence of ligands, and in Eu/Zr-MOFs material exists charge transfer between ligand and rare earth Eu3 + ions, namely the antennaeffect.3. In the ion fluorescence sensing research of NH2-UIO-66, it shows that NH2-UIO-66 has a very strong sensitivity on fluorine ion, can be used for the detection of fluorine ion. It was found that the interference effect of Cl-, I-, Br- ion on NH2-UIO-66 detection of fluorine ion is very small from interference ion experiments. Exploring the mechanism of fluoride detection, the preliminary judgment is that NH2-UIO-66 has high selectivity for fluoride ion for the formation of a hydrogen bond with amino and fluoride ion, leading to the enhanced fluorescence intensity.4. A study on the organic small molecules’ fluorescence sensing of Eu/Zr-MOFs.Experiments show that organic small molecules for Eu/Zr-MOFs fluorescence can change,but different organic small molecule leads to different impact strength for double chromospheres, especially formaldehyde, it will greatly improves the emission peak of 453 nm and has slightly red shift.at the same time, the characteristics of Eu3+emission summit appear weak quenching phenomenon. According to the quenching effect and enhancement effect of fluorescence intensity, Eu/Zr-MOFs have a strong sensitivity for formaldehyde.