Water-Stable -MOFs for Methane and Carbon Dioxide Storage.

We utilized the platform of MOFs for the synthesis of two new water-stable compounds based on amide functionalized trigonal tritopic organic linkers HBTBTB (L1), HBTCTB (L2) and Al metal ions, namely, and . The mesoporous material exhibits an impressive methane (CH) uptake at high pressures and ambient temperature. The corresponding values of 192 cm (STP) cm, 0.254 g g at 100 bar, and 298 K are among the highest reported for mesoporous MOFs, while the gravimetric and volumetric working capacities (between 80 bar and 5 bar) can be well compared to the best MOFs for CH storage. Furthermore, at 298 K and 50 bar, adsorbs 50 wt % (304 cm (STP) cm) CO, values among the best recorded for CO storage using porous materials. To gain insight into the mechanism accounting for the resultant enhanced CH storage capacity, theoretical calculations were performed, revealing the presence of strong CH adsorption sites near the amide groups. Our work demonstrates that amide functionalized mesoporous -MOFs can be valuable for the design of versatile coordination compounds with CH and CO storage capacities comparable to ultra-high surface area microporous MOFs.