sample heated from room temperature to 300 °C and then cooled back to room temperature. The reciprocal space data (total scattering structure factor, S(Q)) are shown in Supplementary Fig. , revealing a loss of crystallinity at around ~300 °C, indicating melting at a temperature much lower than the Tm of unmodified ZIF-62 (~450 °C). The PDF data in Fig. mainly show changes in the intensities and shape of the peaks around 2, 4, and 6 Å, which all appear to broaden with increasing temperature.