Synthesis,Structures And Properties Of Coordination Polymers From Carboxylic Acid Ligands

Metal organic frameworks?MOFs?are a new type of porous materials.Because of the diversity of their structures,organometallic frameworks have wide application prospects.A large number of literatures show that carboxylic acid ligands occupy a large proportion in the construction of metal organic framework,which is mainly because metal ions can well coordinate with oxygen atoms in carboxyl group.Compared with monocarboxylic acid,polycarboxylic acid has the advantages of stronger coordination ability,more flexible coordination mode,better stability and larger pore size of coordination polymer.In recent decades,metal organic frameworks with various structures have expanded the development of metal complexes and promoted the inter disciplinary communication.In this paper,a series of coordination polymers were synthesized by using different ligands under solvent thermal conditions.The main contents of this paper are as follows:1.We synthesized cobalt complex A1 by using CoF₂ and 2,5-pyridine dicarboxylic acid.Cobalt complex A2 was synthesized by CoF₂ and 3,5-pyridine dicarboxylic acid.Cobalt complex A3 was synthesized by CoF₂ and 2,3-pyridine dicarboxylic acid.These cobalt complexes were characterized by XRD,crystal structure and infrared spectrum,and the structure of the new compounds were verified and determined.Moreover,solid fluorescence,thermogravimetric analysis,and photocatalytic CO₂ reduction properties of cobalt complexes A1,A2 and A3 were also studied.2.The compound A4 was synthesized by MgCl₂ and tetra-benzoic acid.The compound A5 was synthesized from MgCl₂ and 4,4-biphenylphthalic acid.The compound A6 was synthesized by SrCl₂ and homobenzoic acid.CaCl₂ and 1,3,5-homobenzoic acid were synthesized into compound A7.We characterized these complexes by X-ray powder diffraction,crystal structure determination and infrared spectroscopy,confirmed the structure of the new compounds,and determined the fluorescence and thermogravimetric physical properties.