Fig. 3. Solution phase NMR measured in DMSO-d6 (lock solvent) with 2 drops of D2SO4 of (a) UiO-66-NH2 post-nitrous acid exposure, (b) UiO-66-NH2, and (c) BDC-OH. Note the presence of strongly deshielded protons between 8.4 and 9.6 ppm (21% by NMR) as well as the presence of resonance consistent with BDC-OH (45% by NMR) and the parent BDC-NH2 (34% by NMR) in (a). Each component integrated to a 1 : 1 : 1 ratio as expected.
