Specifically, to estimate ∆Hads for the Cu I M-MFU-4l frameworks, we chose a 40 K temperature range where the strong adsorption sites are not fully saturated at 0.01 bar while the uptake approaches one H2 per Cu I near 1 bar. The reasons for these criteria are (i) to avoid steep H2 uptake in the low-pressure region, which may reduce the reliability of the pressure reading due to the limitation of the pressure transducer of the instrument, and (ii) to ensure appreciable H2 capacities.