Imidazolium‐Based Ionic Polymers Containing Electrostatic and Triple Hydrogen Bond for Efficient Conversion of CO2 into Cyclic Carbonates

The catalytic conversion of carbon dioxide (CO2) into valuable chemicals offers a promising solution to mitigate global warming. However, the high thermodynamic and kinetic stability makes CO2 activation challenging, typically requiring harsh conditions. This study presents an ionic polymer, (HO)3‐ImbTbIP, synthesized via the quaternarization of 1,2,4,5‐tetrakis(bromomethyl)benzene (Tb) with 1,3,5‐tri(1H‐imidazol‐1‐yl)benzene (Imb) and 2‐(hydroxymethyl)‐2‐(1H‐imidazol‐1‐yl)propane‐1,3‐diol (HO)3. The polymer features imidazolium ionic liquids and triple hydrogen bonds, where (HO)3 moieties weaken the C‐O bond of epoxides, and bromide anions act as nucleophiles to facilitate epoxide ring‐opening. Simultaneously, CO2 activated by imidazolium reacts with oxyanion intermediates to form alkyl carbonate species. Remarkably, (HO)3‐ImbTbIP efficiently converts CO2 to cyclic carbonates under mild conditions (120 °C, 1 bar CO2). This work advances the understanding of CO2 conversion and highlights the potential of task‐specific polymers for sustainable catalysis.