Structure And Properties Of Inorganic-organic Hybrid Materials Based On Polyoxomolybdate

As an important component of polyoxometalates,polyoxomolybdate has attracted much attention because of its complex structure and excellent properties.In this paper,a novel inorganic-organic hybrid material based on polyoxomolybdate was synthesized by molecular self-assembly.In the experiment we chose polyoxomolybdate as inorganic polyoxometalates material,carboxylic acid compounds containing nitrogen as an organic ligands,through constant exploration and research of these compounds reaction conditions such as reaction temperature,testing the p H of the solution changes,change the molar ratio of reactants,extend or shorten the reaction time and so on,in the end was synthesized four inorganic-organic hybrid compounds based on polyoxomolybdate:[Ag(Hpi)(Mo₃O₁₀)](1)[Zn(H₂O)₂(Hpidc)₂][(Mo₈O₂₆)(Hpi)₂]·5H₂O(2)[Zn₂(pidc)₂(H₂Mo₄O₁₃)](3)K(Mo₈O₂₆)[(bpy)_1.5(Hbpy)]₂·H₃O(4)Among,pi=2-(pyridine-3-yl)-1H-imidazole);H₂pidc=2-(pyridine-3-yl)-1H-imidazole-4,5-dicarboxylic acid;bpy=bipyridineCompound 1,the adjacent[Mo₃O₁₀]^2-chain is linked into a two-dimensional layer by Ag⁺cation.It is linked into a three-dimensional supramolecular structure by?··?stacking and hydrogen bonding.Compound 2 is a?-type octamolybdate compound,which is a three-dimensional supramolecular compound formed by the ligand and polyoxometalates linked together by Zn ions through?···?stacking.Compound 3,the metal Zn is linked with the ligand to form a one-dimensional{Zn₂(pidc)₂}polymer chain,which is then linked by a single{Mo₄O₁₃}cluster and{Zn₂(pidc)₂}polymer chain to form a three-dimensional grid structure.Compound 4 is a novel three-dimensional supramolecular compound,which is composed of a?-type octamolybdate fragment and a bipyridine ligand with K⁺as a linker.These four compounds were characterized by powder X-ray diffraction,single crystal X-ray diffraction,thermogravimetric analysis,infrared spectroscopy,elemental analysis and other means.The results showed that compounds 1-3 had fluorescence properties,compounds 1 and 4 had photocatalytic degradation properties,and compound 1 also had antibacterial properties.In addition,compound 4 also has photocatalytic degradation and electrochemical properties,as well as electrocatalytic properties of sodium nitrite and potassium bromate.