Syntheses And Properties Of Coordination Polymers Containing Pyridine Ligands

In recent years,metal-organic frameworks?MOFs?and porous coordination polymers?PCP?have been rapid development.They known by the scientific community owing to their extremely high porosities,tunable pore structures,chemieal diversity,high specific surface area and having the characteristics of unsaturated metal distribution sites,etc.MOFs has been widely used in catalytic reaction,electromagnetic,reaction conduction,fluorescence,film,sustained release,gas storage and separation,especially in the area of gas storage is a high degree of recognition,the application prospect of the light.Some porous coordination polymers were prepared by hydrothermal synthesis method and solution synthesis method in this thesis,and some properties of them,such as gas storage and gas-sensitive response were investigated.The main contents are listed as follows:First,a 3D nanoporous coordination framework [Ni₂?nic?₄?H₂O?]n?nic=Nicotinic acid?was obtained by hydrothermally from a mixture of C₄H₆NiO₄·4H₂O and Nicotinic acid.The structure and properties of the product were characterized by X-ray diffraction?XRD?,scanning electron microscope?SEM?,thermal gravimetric analysis?TG?,and FT-IR respectively.Its gasesstorage ability was also investigated.When [Ni₂?nic?₄?H₂O?]n was heated at the tempertuare of 350?,a nanoscale NiO particle was got,and its structure and physicochemical properties were also characterized.This kind of NiO particle has good ability of methylbenzene storage,and gas-sensitive response for H₂,CO,CO₂ and ethanol.Second,two MOFs({[Ni₄?D-ala?₂?L-ala?₂?1,2-bpe?4]·17H₂O}n and{[Cu₄?D-ala?2?L-ala?₂?1,2-bpe?₄]·17H₂O}n [?D-ala=D-alanine anion,L-ala=L-alanine anion,1,2-bpe=1,2-bis?4-pyridyl?ethylene]?were obtained by using DL-Alanine and Cu???,Ni???as starting materials.The MOFs show some interesting properties,for example,thermal stability and high specific surface area etc.Their structures were characterized,and they also had good abilities for toluene adsorption.Finally,the ligand 2,2':6',2"-Terpyridine-4'-carboxylic acid was employed to prepare two 3D porous coordination polymers,and the further study on hydrogen adsorption properties are under way.