Expanded Porous MOF-505 Analogue Exhibiting Large Hydrogen Storage Capacity and Selective Carbon Dioxide Adsorption

An expanded 4,4-paddlewheel-connected
porous MOF-505-type metal–organic framework (MOF), [Cu2(PDEB)­(H2O)2]·xS (NJU-Bai12; NJU-Bai represents the Nanjing University Bai group
and S represents noncoordinated solvent molecules) has been designed
from a nanosized rectangular diisophthalate linker containing alkyne
groups 5,5′-(1,4-phenylenedi-2,1-ethynediyl)­bis­(1,3-benzenecarboxylic
acid). This MOF material possesses permanent microporosity with the
highest Brunauer–Emmett–Teller surface area of 3038
m2·g–1 and the largest unsaturated
total hydrogen storage capacity of 62.7 mg·g–1 at 77 K and 20 bar among reported MOF-505 analogues. Additionally,
NJU-Bai12 also exhibits excellent carbon dioxide (CO2)
uptake capacity (23.83 and 19.85 mmol·g–1 at
20 bar for 273 and 298 K, respectively) and selective gas adsorption
properties with CO2/CH4 selectivity of 5.0 and
CO2/N2 selectivity of 24.6 at room temperature.