Synthesis,Structures And Properties Of Metal-Organic Frameworks Based On Trigonal Carboxylic Ligands

For their large surface area,functional channel,controlled structure and so on,metal-organic frameworks?MOFs?as a new type of porous crystalline material have been widely used in gas adsorption separation,fluorescence detection,electrochemical properties,drug delivery and other aspects.In this work,based on H₃TATB and H₃SIPA organic ligands,eight metal-organic frameworks are designed and sythesised under solvothermal conditions.The structures and properties of the eight MOFs were characterized by X-ray single crystal diffraction,elemental analysis,thermogravimetric analysis,infrared analysis,X-ray powder diffraction and gas adsorption test.The main research contents as the following points:1?Using complex 1 constructed by H₃TATB and Co²⁺under solvothermal conditions as a precursor,a hollow N-doped porous carbon material was prepared through a controllable pyrolysis process.The prepared porous material was a excellent cathode material of lithium and sodium battery which show high cycle and ratio performance.2?Three metal-organic frameworks were constructed by H₃TATB and Zn²⁺under solvent control and pH control?with different amounts of HBF₄ acid?process?Complexes 2,3,4?.In these structures,?-H₂O bridges different number of SBUs,respectively.We also investigated its fluorescent sensing for metal cations and nitroaromatic compounds.The results showed that the complex 2 can identify 4-NPH and Fe³⁺.3?Two new MOFs?5-6?were synthesized based on H₃TATB and N-containing co-ligands under the solvothermal conditions.Complex 5 with the rigid 4,4'-bipy as co-ligand displayes a 3 D net of a non-intercalated CdSO₄ topology,while complex 6 with the flexible1,3-dpp as co-ligand showes the 2-fold interpenetrating CdSO₄ topology.The applications of complex 5-6 on electrochemical properties were also studied.4?Two metal-organic frameworks?7-8?were synthesized by the assembling of H₃SIPA ligand with Cu²⁺or Ba²⁺.Complex 7 is a three-dimensional structure with planar quadruple SBU.The selective fluorescent sensing of metal ions and nitro-containing aromatic compounds were studied,using complex 7 as fluorescer.The results showed that complex 7can identify 4-NP and Fe³⁺.