Tuning CO 2 uptake capacity in covalent organic frameworks via metal doping

Covalent organic framework (COF) structures have been synthesized and doped with Cu²⁺, Mn²⁺, and Zn²⁺. Incorporation of a phenol moiety increases metal doping capacity by 2-5% by mass, and results in increased CO₂ adsorption by as much as 40%, compared to undoped structures. Interestingly, gas uptake is improved even though the incorporation of cations in the pore lowers the overall surface area of the structures.