Selective adsorption of SO2 is realized in a porous metal–organic framework material, and in‐depth structural and spectroscopic investigations using X‐rays, infrared, and neutrons define the underlying interactions that cause SO2 to bind more strongly than CO2 and N2.
Thermally-densified hafnium terephthalate UiO-66(Hf) is shown to exhibit the strongest isotropic negative thermal expansion (NTE) effect yet reported for a metal-organic framework (MOF). Incorporation of correlated vacancy defects within the framework affects both the extent of thermal densification and the magnitude of NTE observed in the densified product. We thus demonstrate that defect inclusion can be used to tune systematically the physical behaviour of a MOF.
Understanding the molecular mechanism
of proton conduction is crucial
for the design of new materials with improved conductivity. Quasi-elastic
neutron scattering (QENS) has been used to probe the mechanism of
proton diffusion within a new phosphonate-based metal–organic
framework (MOF) material, MFM-500(Ni). QENS suggests that the proton
conductivity (4.5 × 10–4 S/cm at 98% relative
humidity and 25 °C) of MFM-500(Ni) is mediated by intrinsic “free
diffusion inside a sphere”, representing the first example
of such a mechanism observed in MOFs.
MFM-300(Al) shows reversible uptake of NH (15.7 mmol g at 273 K and 1.0 bar) over 50 cycles with an exceptional packing density of 0.62 g cm at 293 K. In situ neutron powder diffraction and synchrotron FTIR micro-spectroscopy on ND @MFM-300(Al) confirms reversible H/D site exchange between the adsorbent and adsorbate, representing a new type of adsorption interaction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.