Figure 2.

(A) ⁶⁷Zn NMR spectra of MOF-5 taken under magic-angle spinning conditions at 21.1 T: fully evacuated (top) and when solvated with DMF using enriched (middle) and natural abundant (bottom) zinc. Asterisks denote spinning side bands. The spectral inset (blue) illustrates the secondary site present within the solvated system. (B) ⁶⁷Zn nonspinning NMR spectra of experimental 97% enriched sample soaked in DMF alongside spectra for two simulated sites collected at 11.7 T. (C) ¹³C MAS NMR spectra taken of CH₂Cl₂- and DMF-soaked MOF-5 with only the methyl region displayed using direct-polarization (DP) and ¹³C[¹H] cross-polarization (CP).