However, the addition of chelation complexes increased the weight of COFs, resulting in a reduced gravimetric working capacity. Secondly, COFs with Q 0 st values in the 7-15 kJ/mol range tend to exhibit the best WC. For instance, although MSUCOF-3-PtCl demonstrated impressive absolute and net uptakes, its WC was inferior to that of the three COF families tested, owing to an overly strong interaction with hydrogen gas, which leads to a large number of loaded molecules strongly binding to the COF, even at low pressures. Third, the Q st tends to decrease to a bulk-filling interaction as gas is loaded into the COF. COFs that maintain Q st within this ideal range even at 700 bar exhibit the most impressive WC. Although MSUCOF-1-PtCl and V P had little to no bearing on predicting which COFs would perform the best.