A Nine-Connected Mixed-Ligand Nickel-Organic Framework and Its Gas Sorption Properties

A nine-connected metal–organic framework [NiII2NiIII(μ3-OH)(IN)3(BDC)1.5]·xSolvent (BDC = benzene-1,4-dicarboxylate, IN = isonicotinate) has been prepared and characterized. The application of the scale-down chemistry through the use of the short and inexpensive BDC and IN ligands leads to a smaller pore size and lower surface area but little compromise in H2 sorption properties. The compound exhibits a high CO2 uptake of 73.1 cm3 g–1 (273 K and 1 atm) despite its moderate Langmuir and BET surface areas (888.3 and 571.0 m2 g–1, respectively). Its H2 uptake (1.47 wt % at 77 K and 1 atm) is also quite high, comparable to that of many materials with high surface area.