Fig. 1. (a) The optimized crystal structure of mmen–Zn2(dobpdc). (b) Well-ordered ammonium carbamate chain formed upon CO2 insertion. (c) Depictions of empty, isolated, and chain geometries along the channel direction (c-axis in the P3221 setting). (d) Potential curves of empty, isolated, and chain geometries compared to the experimental Zn–OCO2 distance indicated by the dotted line.
