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An Ultra‐Microporous Metal–Organic Framework with Exceptional Xe Capacity
Author(s) -
Chakraborty Debanjan,
Nandi Shyamapada,
Maity Rahul,
Motkuri Radha Kishan,
Han Kee Sung,
Collins Sean,
Humble Paul,
Hayes James C.,
Woo Tom K.,
Vaidhyanathan Ramanathan,
Thallapally Praveen K.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002331
Subject(s) - microporous material , metal organic framework , xenon , materials science , nanotechnology , environmental science , chemistry , adsorption , organic chemistry , composite material
Molecular confinement plays a significant effect on trapped gas and solvent molecules. A fundamental understanding of gas adsorption within the porous confinement provides information necessary to design a material with improved selectivity. In this regard, metal–organic framework (MOF) adsorbents are ideal candidate materials to study confinement effects for weakly interacting gas molecules, such as noble gases. Among the noble gases, xenon (Xe) has practical applications in the medical, automotive and aerospace industries. In this Communication, we report an ultra‐microporous nickel‐isonicotinate MOF with exceptional Xe uptake and selectivity compared to all benchmark MOF and porous organic cage materials. The selectivity arises because of the near perfect fit of the atomic Xe inside the porous confinement. Notably, at low partial pressure, the Ni–MOF interacts very strongly with Xe compared to the closely related Krypton gas (Kr) and more polarizable CO 2 . Further 129 Xe NMR suggests a broad isotropic chemical shift due to the reduced motion as a result of confinement.