Functionalization And Properties Of UiO Series Metal-organic Frameworks

Metal-organic frameworks?MOFs?are a class of functionalized crystalline materials with high specific area,high porosity and structural modification.They have been widely used in the fields of fluorescence sensing,drug release,catalysis and so on.In this paper,organic bridging ligands(L_NH2,L_NO2,L_OMe)with bifunctional groups have been selected and reacted with metal salts ZrCl₄,and a series of functionalized MOFs materials?SO₂-UiO-67-R,R=-NH₂,-NO₂,-OMe?have been obtained by solvothermal method.Luminescence studies indicate that SO₂-UiO-67-NH₂ shows strong fluorescence,and it can be used as luminescent sensors for selective sensing of antibiotics.Moreover,using the post-synthetic modification strategy,SO₂-UiO-67-M/Schiff decorated with different Schiff base metal complexes have been constructed and characterized.Additionally,the catalytic performances of the synthesized complexes for styrene oxidation have been investigated.The main contents of this paper are as follows:1.Syntheses and characterization of SO₂-UiO-67-M/Schiff:With the post-synthetic modification strategy,SO₂-UiO-67-M/Schiff(M=Cu^II,Mn^II,Co^II,V^IV)decorated with different Schiff base complexes have been constructed by two steps.The structures and the properties of the synthesized complexes have been characterized by XRD,IR,TG,et al.2.Catalytic performances of SO₂-UiO-67-M/Schiff for styrene oxidation:Firstly,the catalytic performances of SO₂-UiO-67-M/Schiff for styrene oxidation have been investigated,and the results indicate that SO₂-UiO-67-Cu/Schiff shows the best catalytic effect.Then,the catalytic properties of SO₂-UiO-67-Cu/Schiff for styrene oxidation have been studied in detail,and the influence of various factors such as reaction time,amount of catalyst,amount of oxidant,reaction temperature,solvent species on the catalytic performances have been studied systematically.In addition,the possible catalytic mechanism has been speculated.3.Syntheses and sensing properties of functional materials SO₂-UiO-67-R?R=-NH₂,-NO₂,-OMe?:using L_NH2,L_NO2O2 and L_OMe as the bridging ligands,a series of SO₂-UiO-67-R?R=-NH₂,-NO₂,-OMe?have been synthesized and characterized.On account of the strong fluorescence of SO₂-UiO-67-NH₂,it was selected as the luminescent sensor for sensing antibiotics.Studies show that SO₂-UiO-67-NH₂ can be a selective sensor for NFT and NFZ via luminescence quenching with fast response,high sensitivity and low LOD.Remarkably,it can be conveniently regenerated for at least four times without sacrificing its quenching efficiency.Additionally,the possible mechanisms for the luminescent quenching have been investigated.