A microporous nickel–organic framework with an unusual 10-connected bct net and high capacity for CO2, H2 and hydrocarbons

Abstract

Presented here is a three-dimensional microporous metal–organic framework [Ni₃(μ₂-H₂O)₂(bdc)₃(pyrazine)₂]·3(DMA) (1, H₂bdc = terephthalic acid; DMA = N,N-dimethylacetamide) with a 10-connected bct net. The trinuclear Ni subunits act as the 10-connected nodes, and both bdc and pyrazine ligands act as the linkers. This uninodal bct net can be considered to be the combination of two subnets: one is the (4,4) layer formed by the Ni₃ nodes and pyrazine linkers, and the other one is the typical pcu net built from the Ni₃ nodes and bdc linkers. Remarkably, this stable microporous framework exhibits high CO₂ and H₂ uptake and good selectivity for CO₂ over N₂ at 273 K. Its sorption capacity for some hydrocarbons is also investigated.