Hydrothermal Synthesis, Crystal Structure And Fluorescent Property Of Inorganic-Organic Hybrid Materials Based On Rare Earth Polyoxometalate

Inorganic-organic hybrid materials are produced by hybrid from inorganic and organic components which have new structures and properties. The organic components with great selectivity can be modified, furthermore the coordination framework can be formed by organic components, metal ions and organic ligands through coordination bonds. So polyoxometalates are very important components in synthesis of new species because of its special structure. There are tremendous activities these years in the area of inorganic-organic hybrid materials based on polyoxometalate because of their diversified structures and interesting properties, which endows these materials with great attention.Recently the addition of novel rare earth to the framework of polyoxometalates is another research hotspot in the area of inorganic-organic hybrid materials.There are four parts in the dissertation.1. Three inorganic-organic hybrid compounds were synthesized successfully. They are [Eu(PW₁₁O₃₉)(H₂O)₂](H₂bpy)₂·6.5H₂O (1), [Gd(PW₁₁O₃₉)(H₂O)₃](H₂bpy)₂·5.5H₂O (2),[Tb(PW₁₁O₃₉)(H₂O)₂](H2bp-y)₂·7H₂O (3), which have original structures.2. Those complexes were characterized by EDS, elemental analysis and IR.3. They were characterized by single-crystal X-ray diffraction. X-ray diffraction result reveals that the complexes have one dimension chain structure. The three crystals are isostructural and crystallized in the triclinic space group P(?). The crystal cell parameters of compound (1) are a=1.17842(5) nm, b=1.35452(4) nm, c=1.77943(9) nm,α=71.502(2)°,β=82.8584(14)°,γ=81.4192(6)°. The parameters of compound (2) are a=1.17590(10) nm, b=1.35450(14) nm, c=1.7817(2) nm,α=71.390(2)°,β=83.000(3)°,γ=81.670(3)°. The parameters of compound (3) are a=1.16750(10) nm, 6=1.34720(15) nm, c=1.7770(2) nm,α=71.3400(10)°,β=83.610(2)°,γ=82.090(2)°.4. Fluorescent activity of compound(1) have been studied. The emission spectrum result shows that compound(1) exhibited intense fluorescence at 550-650 nm under 395nm UV excitation .5. The optimal reaction conditions of compound (1) and compound (2) are concluded, including reaction time, temperature, solvent quality, proportion of reactants and pH value.