Fig. 4. (a) Crystal structure of Zn2(BDC-NH2)2(DABCO) showing how 2D paddlewheel sheets of Zn2(BDC-NH2)2 are pillared via DABCO units: Zn – orange, C – cyan/green for BDC/DABCO, N – light blue/blue for BDC/DABCO, O – red. (b) Nitrous acid breakthrough curves for three adsorption/desorption cycles of Zn2(BDC-NH2)2(DABCO); these breakthrough experiments were run between 100 and 160 ppbv nitrous acid mixing ratios to ensure that the MOF has optimal interaction time with nitrous acid. Stoichiometric equivalents for the first breakthrough can be found in Table S2.† .
