Modulating CO2 Adsorption in Metal–Organic Frameworks via Metal-Ion Doping

One novel metal-organic framework {[Ni6(OH)4(BTB)8/3(H2O)6]·4H2O·9DMF} n (DMF = dimethylformamide) based on 1,3,5-benzenetribenzoic acid (H3BTB) was successfully synthesized under basic condition at room temperature, featuring a unique twofold interpenetrated pcu-type net with [Ni6(OH)4(COO)8(H2O)6] cluster as building block. Its gas-adsorption behaviors were investigated and modified by utilizing metalII-doped procedure, which was certified to be a highly effective pathway in enhancing CO2 uptake capacity.