For CO 2 capture applications, an ideal MOF will exhibit structural stability, be robust to thermal fluctuations and contaminant molecules, and display high species selectivity for CO 2 . In the direct-air capture (DAC) of CO 2 , where concentrations are around 400ppm 10 , selectively adsorbing only a) These two authors contributed equally CO 2 is critical for deployable systems. There are numerous different mechanisms for tuning a material to be highly selective for CO , including gating of the kinetic diameter , geometry gating , and amine-functionalization . The latter approach is the focus of this paper. In this situation, an environment exists that selectively allows the adsorption of CO 2 via a chemical bond , so-called chemisorption.