Porous Cd-carboxylate frameworks tuned by the bulk of linker: Interpenetrated nets, selective CO2 uptakes and high water vapor adsorption

•3D interpenetrated porous Cd-MOFs•4-Connected Cd(COO)4 and 8-connected Cd3(COO)8 SBUs•2-Fold interpenetrated qtz and self-penetrated bcu nets•Selective CO2 uptakes and high water vapor adsorption performance.

Reported herein are two porous interpenetrated anionic Cd-carboxylate frameworks tuned by the length of organic linker. Shorter BDC linker and [Cd(COO)4] building blocks in 1 generate a rare 4-connected 2-fold interpenetrating qtz network. But longer NDC linker in 2 produces a self-penetrated 8-connected bcu framework with [Cd3(COO)8] SBUs. 1 and 2 both show selective CO2 adsorption and significantly, 2 exhibits the highest water vapor uptake performance (281 cm3·g− 1 at 298 K and P/P0 = 0.95) among all the interpenetrated MOFs.

Graphical abstractThe bulk of linkers introduced to two 3D interpenetrated porous Cd-MOFs exhibiting 2-fold interpenetrated qtz and self-penetrated bcu nets, which have selective CO2 uptake and highest water vapor uptake performance among all the interpenetrated MOFs.Figure optionsDownload full-size imageDownload as PowerPoint slide