family boasts an exceptional gravimetric uptake of up to 19.2 wt %. The incorporation of TM through chelation significantly increases volumetric at the expense of slightly diminished gravimetric uptakes. Heavier precious metals add significant weight to the COFs with similar volumetric performance as first row TM. Therefore, pristine COFs, as well as chelated COFs with the most promising first-row TM, achieve the maximum gravimetric uptakes. This further demonstrates how Co, Ni, Mn, and Fe may be more favorable than Pd and Pt, as they often reach similar uptakes while contributing much less weight and cost.