A Zeolite-Like Zinc Triazolate Framework with High Gas Adsorption and Separation Performance

The reaction of commercially available 3-amino-1,2,4-triazole
(Hatz)
and Zn­(OH)2 at room temperature produced a porous zeolite-like
metal azolate framework, [Zn­(atz)2] (MAF-66). Single-crystal
X-ray diffraction studies of MAF-66 showed that atz– served as an imidazolate-type ligand, linking tetrahedral ZnII ions to form a noninterpenetrated dia framework,
which contains a narrow, three-dimensional intersecting channel system
(void = 49.8%) functionalized by amino groups and uncoordinated triazolate
N atoms on the pore surface. Gas-sorption measurements of MAF-66 revealed
high CO2 uptakes (27.6/19.4 wt % at 273/298 K and 1 atm)
and high Henry’s law CO2/N2 selectivity
(403/225 at 273/298 K). The host–guest interactions between
CO2 and the pore surface were also studied by in situ IR
absorption spectroscopy and powder X-ray diffraction measurements.