Ionic Liquid Immobilized Fe‐MIL‐101‐NH 2 Efficiently Catalyzes the Chemical Fixation of CO 2 with Epoxides to Form Cyclic Carbonates

Abstract In this work, two ionic liquids (ILs) immobilized metal‐organic frameworks (MOFs), Fe‐MIL‐101‐3N(BuBr) and Fe‐MIL‐101‐N(Bnme 2 )Br, were obtained by modifying amino groups in Fe‐MIL‐101‐NH 2 with bromobutane and quaternary ammonium salt. The ionic liquid immobilized MOFs have Lewis acid sites (Fe 3+ ) and nucleophilic sites (Br − ), which can synergistically catalyze the cycloaddition reaction of CO 2 and epoxides. Various cyclic carbonate derivatives were obtained in excellent yields under the optimal conditions. Additionally, we found that Fe‐MIL‐101‐N(Bnme 2 )Br exhibited the highest catalytic activity and it can be easily recovered and reused for at least 5 times without loss of catalytic activity. Our method of preparing bifunctional catalysts provides a new approach to design catalysts for the chemical conversion of CO 2 .