| Chemical reactions are inseparable from catalysts,and metal nanoparticles,especially transition metals,have been widely studied and applied as high-efficiency catalysts.In the past few decades,metal organic frameworks(MOFs)and covalent organic frameworks(COFs)have been used as supports for supporting metal nanoparticles to catalyze various organic reactions.These frameworks are widely used because of their stability,inherent porosity,etc.,but most of these catalysts are heterogeneous catalysts,and the catalytic sites are not fully utilized.Recently,porous organic cages have been used as a framework for pure organic,inherent voids and good crystallinity to encapsulate metal nanoparticles.Organic cages can control metal nanoparticles at a few nanometers,resulting in highly efficient dispersibility of the catalyst.In this paper,the catalytic properties of the [4+6] organic cage with hydroxyl group and its encapsulated silver nanoparticles were studied.Ⅰ.As the continuation of our group previous work,the organic cage POC was synthesized,and AgNPs@POC was prepared by homogeneous adsorption reduction method.The nitrobenzene self-coupling reaction was efficiently catalyzed by irradiation at room temperature and visible light.The catalyst was able to be recycled4 times without a significant decrease in yield.Ⅱ.The use of POC and reduced HPOC attempts to catalyze the reaction of carbon dioxide and epoxide.These two organic catalysts are capable of catalyzing the reaction of carbon dioxide and epoxide under mild conditions and have a high yield.However,its universality is not very good,and the catalytic effect of the epoxide with a small substituent is better,and the catalytic efficiency of the epoxide with a substituent of a benzene ring and a long chain is not satisfactory.In summary,we carried out the encapsulation of silver nanoparticles on the basis of the organic cage POC and the reduction of the self,and the catalyst was subjected to the nitrobenzene self-coupling and the catalytic reaction of carbon dioxide andepoxide ring-opening addition.These studies provide a reference experience for the later preparation of more environmentally friendly,more catalyzed catalysts. |
