Syntheses,Structures And Properties Of Keggin And Octamolybdate Compounds Based On 3,5-Bis(1H-Imidazol-1-yl) Benzoic Acid

Polyoxometalates,as inorganic ligands with excellent physical and chemical properties,have a wide range of applications in the fields of catalysis and adsorption.In this work,we selected a tridentate organic ligand containing N and O donors:3,5-di（1H-imidazol-1-yl）benzoic acid（HDIBA）,and synthesized seven inorganic-organic compounds based on Keggin-type polyacids and octamolybdic acid using a hydrothermal synthesis method:[Co₂（HDIBA）₂（DIBA）₂（H₂O）₄]·HPW₁₂O₄₀·2H₂O（1）;[Ni₂（HDIBA）₂（DIBA）₂（H₂O）₄]·HPW₁₂O₄₀（2）;[Ag（H₂DIBA）₂·PW₁₂O₄₀]·2H₂O（3）;[Ag（H₂DIBA）₂·PMo₁₂O₄₀]·2H₂O（4）;[Ag（H₂DIBA）₂·HSi Mo₁₂O₄₀]·2H₂O（5）;[Co₂（HDIBA）₂(γ-Mo₈O₂₆)（H₂O）₄]·H₂O（6）;[Ni₂（HDIBA）₂(γ-Mo₈O₂₆)（H₂O）₄]·H₂O（7）;The discrete units of 1 are further extended into a 3D supramolecular structure byπ···πstacking and hydrogen bonding interactions.In compound 2,wavy ladderlike bimetallic chains are linked by hydrogen bonding interactions to form a 3D supramolecular structure with cage holes,and POMs filled in the cages.In compounds 3-5,POMs act as bidentate inorganic bridging ligands to link[Ag（H₂DIBA）₂]³⁺into 1D chains.In compounds 6 and 7,the POMs are linked by the metal and the organic ligands to form 2D layered structures.The voltammetric behaviors and electrocatalytic properties of compounds 1-7 were studied.Compounds 4、6 and 7possess amperometric sensing performance toward Br O₃^-.The removing organic dye pollutants behaviors of 1-7 were explored.In addition,antibacterial/antifungal activities and photoluminescence properties of 3-5 were also investigated.