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A porous organic polymer with aminopyridine functionalities was designed to fabricate a stable, atomically dispersed Ir catalyst. This Ir-based SAC exhibits excellent catalytic activity during the liquid phase hydrogenation of CO 2 to formate, with a turnover number as high as 25,135 representing the best performance yet for a heterogeneous conversion of CO 2 to formate. The chemical structure of the Ir SAC is analogous to that of a homogeneous mononuclear complex catalyst, representing an intermediary between heterogeneous and homogeneous catalysis.

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