A NbO-type MOF based on an aromatic-rich and N-functionalized diisophthalate ligand for high-performance acetylene storage and purification†
A porous MOF ZJNU-93 based on a custom-designed diisophthalate ligand bearing an aromatic-rich backbone and N-functionalized sites was solvothermally synthesized and fully characterized. Single-crystal X-ray diffraction studies revealed that ZJNU-93 is a three-dimensional (4,4)-connected NbO-type network composed of dicopper paddlewheel units and organic linkers as 4-connected building blocks. Furthermore, its gas adsorption properties with respect to C2H2, CO2, and CH4 were systematically studied, revealing its promising utility as an adsorbent for the storage as well as separation and purification of C2H2. More specifically, the C2H2 uptake capacity reaches 164.0 cm3 (STP) g−1, while the estimated C2H2/CO2 and C2H2/CH4 adsorption selectivities are as high as 4.5 and 34.4 at 298 K and 1 atm. ZJNU-93 represents a rare MOF displaying high C2H2 storage and separation capacities at the same time.