Figure 1.

(a) Structure of the metal−organic framework Mg₂(dobpdc). Grey, red, and green spheres represent C, O, and Mg atoms, respectively; hydrogen atoms are omitted for clarity. The diamine-appended material exhibits cooperative CO₂ adsorption arising from (b) insertion of CO₂ into the Mg–amine bond followed by proton transfer to form an ammonium carbamate, a process that propagates down the c-axis of the material. In this work, we expand this family of materials by demonstrating cooperative CO₂ adsorption in alcohol- and alkoxyalkylamine-appended variants of Mg₂(dobpdc).