Synthesis And Catalytic Properties Of Porous Materials

Metal nanoparticles?NP?,due to their size effect,surface effect and so on,make its show significant advantages in catalytic reaction,but in the process nanoparticles are easy to loss,difficult to recycle,easy to gather and inactivation.Metal nanoparticles?NPs?are combined with the porous supports such as metal-organic frameworks?MOFs?or covalent organic frameworks?COFs?to form stability heterogeneous catalyst become the choice of this topic objects.Herein we successfully synthesized a Mn???-MOF-supported Pd-Au alloy NP catalystfor the one-pot tandem synthesis.In addition,the chiral Pd@CCOF-MPC catalyst was prepared for the Henry reaction and reductive Heck reaction.?.A new Mn???metal-organic framework?MOF?was synthesized by the combination of 4,4,4-trifluoro-1-?4-?pyridin-4-yl?-phenyl?butane-1,3-dione?L? and Mn?OAc?₂ in solution.Mn???-MOF features a threefold-interpenetrating NbO net containing honeycomb-like channels,in which the opposite Mn???···Mn???distance is 23.5075?10??.Furthermore,Mn???-MOF can be an ideal platform to support Pd-Au bimetallic alloy nanoparticles to generate a composite catalytic system of Pd-Au@Mn???-MOF.Pd-Au@Mn???-MOF can be a highly active bifunctional heterogeneous catalyst for the one-pot tandem synthesis of imines from benzyl alcohols and anilines and from benzyl alcohols and benzylamines.?.We herein report the fabrication of a palladium nanoparticles?Pd NPs?loaded homochiral covalent organic framework using S-?+?-2-methylpiperazine and cyanuric chloride?Pd@CCOF-MPC?via a very facile chemical approach.The chiral COF support of CCOF-MPC is synthesized by the combination of cyanuric chloride and S-?+?-2-methylpiperazine at 90?for 36 h,and the Pd NPs-loaded Pd@CCOF-MPC is prepared via sequential solution impregnation and NaBH₄ reduction at room temperature.Pd@CCOF-MPC,as a highly active reusable asymmetric heterogeneous composite catalyst,is able to effectively promote the Henry reaction and reductive Heck reaction in high yield with excellent stereoselectivity.In conclusion,composite heterogeneous catalytic systems were demonstrated to be highly efficient heterogeneous catalysts,which provided new methods to synthesis many more new and practical catalysts.