Ultra-microporous Metal-organic Framework with High Concentration of Free Carboxyl Groups and Lewis Basic Sites for CO2 Capture at Ambient Conditions

How to rationally design effective and practical COadsorbent is a great challenge. Herein, an ultra-microporous metal-organic framework(FJI-H19) with high concentration of free carboxyl groups and uncoordinated Lewis basic sites has been synthesized from a multi-dental ligand with a high proportion of polar CO-philic atoms. FJI-H19 displays a relatively high COvolumetric uptake(120 cm~3?cm) with high selectivity under practical atmosphere(298 K and 1 bar). Further researches demonstrate that such high adsorption results from an unusual synergistic effect from free carboxyl group and uncoordinated N atoms. This result will provide a potential strategy for developing more effective and pratical COadsorbent based on MOFs.