In summary, we discovered an as-of-yet unknown ordering transition in MOF composites made Synthesis of IL@MOF Composites. CuBTC and FeBTC were evacuated at 105 °C under vacuum overnight to remove water and volatile impurities. IL@MOF composites were prepared using wet impregnation at IL loading of 48 wt%, according to previous reports. Briefly, in a sealed container 0.48 g of IL was dissolved in 20 mL of acetone and stirred for 1 h at 25 °C. Afterwards, evacuated MOF material (0. to accentuate high r correlations. All processing of the total scattering data was performed using GudrunX following well-documented procedures .