Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 15, Pages 4640-4646Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm502189c
Keywords
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Funding
- Science and Industry Endowment Fund (SIEF)
- Australian Institute of Nuclear Science and Engineering
- Australian Research Council
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An ultrarnicroporous metal-organic framework (MOF) is reported that contains 0.35 nm nanotube-like channels with an unprecedented concentration of vacant Cu-II coordination sites. The nonintersecting, narrow channels in [Cu-3(cdm)(4)] (cdm = C(CN)(2)(CONH2)(-)) align in two perpendicular directions, structurally resembling copper-doped carbon nanotubes with Cu-II embedded in the walls of the channels. The combination of ultramicroporosity with the exposed Cu-II coordination sites gives size-based selectivity of CO2 over CH4, based on pore-size distribution and modeling. Neutron powder diffraction and molecular dynamics simulations show the close packing of single rows of guests within the tubular nanostructure and interaction of CO2 with the exposed metal sites.
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