PCN-222(Co) Metal-Organic Framework Nanorods Coated with 2D Metal-Organic Layers for the Catalytic Fixation of CO2 to Cyclic Carbonates

In this work, a functionalized metal-organic layer (MTTB MOL) was first synthesized and characterized, where MTTB means that it was synthesized from TTB (4,4',4 ''-s-triazine-2,4,6-triyl-tribenzoate). On this basis, a hybrid metal-organic framework of PCN-222(Co)@MTTB was further synthesized by combining two-dimensional (2D) MTTB MOLs and three-dimensional (3D) PCN-222(Co) MOFs (metal-organic frameworks) via a one-step method. When applied to the cycloaddition reaction of carbon dioxide (CO2) and epoxides, PCN-222(Co)@MTTB was found to exhibit excellent synergistic catalytic performance under mild conditions. The unique catalytic activity of the composite is due to the combination of the exposed acidic sites (Co2+, Ze(4+)) and basic sites (-N- groups) within the matrix of the MOF structure, thereby providing a new method for the exploration of effective catalysts for the conversion of CO2 to value-added chemicals under mild conditions.