Preparation Of Palladium Catalysts Supported On MOFs Or POPs And Their Application In Catalysis

Metal-organic frameworks(MOFs)and organic porous polymers(POPs)materials have been widely used in heterogeneous catalysis due to their porous properties.Palladium catalysts were loaded into MOFs or POPs materials via ligand pre-modification,post-synthetic modification and in situ approach in this article,and their heterogeneous catalytic properties in palladium catalyzed reactions were studied.I.A novel palladium N-heterocyclic bis-carbene dicarboxylate ligand(Pd-NHDC-H2L)was successfully synthesized.In addition,the Pd-NHDC containing Ui O-67 type MOF(Ui O-67-Pd-NHDC)was prepared based on the size-matched ligand mixture of biphenyl-4,4'-dicarboxylic acid/Pd-NHDC-H2 L under solvothermal conditions.The obtained Ui O-67-Pd-NHDC was characterized by means of PXRD,ICP,XPS,BET and so on.It can be a highly heterogeneous catalyst to promote Heck cross-coupling reaction,intermolecular benzyne-benzyne-alkene inserting reaction and Strecker reactions.II.An organic porous material based on the structure of diimine was synthesized.The material was characterized by means of PXRD,IR,BET,TGA,and was further modified to obtain organic porous material based on Pd-diimine structure(Pd-diimine-POPs),which can efficiently catalyze the suzuki coupling reaction and can be recycle used for at least 5 times.III.An organic porous material based on the structure of chiral oxazoline-imidazolium salt was synthesized.Pd nanoparticles were produced in situ during solvothermal preparation,Which were further adsorbed into the pores of the materials.We characterized the materials by means of IR,XRD,TGA,BET and so on.Electron microscope analysis showed that Pd nanoparticles were uniformly dispersed in POPs materials.The chiral covalent organic material loaded on Pd nanoparticles was expected to be used in palladium catalyzed chiral organic reactions.The results show the palladium catalysts supported on MOFs or POPs materials prepared by different synthesis strategies have good catalytic activity and stability.High efficient heterogeneous catalysis was realized in various palladium catalyzed reactions,which enrich the kinds of heterogeneous catalysts and provide new ideas for the preparation of heterogeneous catalysts based on MOFs or POPs.