Synthesis,Characterization And Properties Of Manganese,Antimony And Bismuth Complexes Of Aromatic Carboxylic Acids

In the synthesis process of complexes,it is still faced with great difficulties to synthesize a product with a specific structure after decades of research,and organic ligand determines the structure of the product,so the selection of appropriate organic ligand is particularly important for the structure and properties of the product.Aromatic carboxylic acid ligands are usually superior organic ligands because of their coordination mode and ability compared with other ligands.In this paper,seven complexes were synthesized by hydrothermal method,room-temperature solid phase mothod or liquid-phase method.The composition and structure of the complexes were tested and characterized,such as elemental analysis（EA）,X-ray single crystal diffraction（SCXRD）,X-ray powder diffraction（PXRD）,infrared spectroscopy（FTIR）and thermal analysis（TG-DSC）.The antibacterial properties,photocatalysis,and fluorescence of some complexes were investigated,and nano oxides were prepared by using complexes as precursors.The research work of this paper is as follows:（1）Two antimony（III）complexes[Sb₂O（pdc）₂（H₂O）₂]and[Sb（6,6′-bpdc）（H₂O）（μ-Cl）]were synthesized with antimony chloride as metal center and 2,6-pyridine dicarboxylic acid（2,6-H₂pdc）or 2,2′-bipyridine-6,6′-dicarboxylic acid（6,6′-H₂bpdc）as ligands.Both complexes showed antibacterial activities against S.aureus.[Sb（6,6′-bpdc）（H₂O）（μ-Cl）]had antibacterial activity against P.aeruginosa.（2）Two complexes（4,4′-H₂bipy）₂[Bi₂Cl₁₀]?2H₂O and（2,2′-H₂bipy）₂[Bi₂Cl₁₀]were synthesized with 4,4′-bipyridine or 2,2′-bipyridine as ligands and bismuth chloride as metal ion.The results of photocatalytic activities showed that（4,4′-H₂bipy）₂[Bi₂Cl₁₀]?2H₂O had photocatalytic degradation activity for Rhodamine B,and the degradation rate was 82%.（2,2′-H₂bipy）₂[Bi₂Cl₁₀]showed degradation activity against both Rhodamine B and Methylene Blue,and the degradation was basically complete within 150 min.（3）Three complexes[Mn Cl₂（bipy）]_n,[Mn（H₂O）₆]·（H₂btca）and[Mn（H₂O）₆]·（H₂bptc）were synthesized with 2,2′-bipyridine,1,2,4,5-homophenotetracarboxylic acid（1,2,4,5-H₄btca）and 3,3′,4,4′-biphenyl tetracarboxylic acid（3,3′,4,4′-H₄bptc）as ligands through the liquid phase method and the room temperature solid phase method,respectively.Solid state fluorescence test showed that three complexes had good fluorescence properties,and[Mn（H₂O）₆]·（H₂btca）could effectively identify methanol,showing obvious quenching effect in methanol solvent.Mn₂O₃/Mn₃O₄ nanoparticles were prepared by calcination using the unpurified[Mn（H₂O）₆]·（H₂bptc）complex as precursor.