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Hybrid Ultra‐Microporous Materials for Selective Xenon Adsorption and Separation

Mona H. MohamedChemistry Department Faculty of Science Alexandria University P.O.Box 426 Ibrahimia Alexandria 21321 EgyptSameh K. ElsaidiChemistry Department Faculty of Science Alexandria University P.O.Box 426 Ibrahimia Alexandria 21321 EgyptTony PhamDepartment of Chemistry University of South Florida 4202 East Fowler Ave., CHE205 Tampa FL 33620 USAKatherine A. ForrestDepartment of Chemistry University of South Florida 4202 East Fowler Ave., CHE205 Tampa FL 33620 USAHerbert T. SchaefPhysical and Computational Science Directorate Pacific Northwest National Laboratory Richland WA 99352 USAAdam HoganDepartment of Chemistry University of South Florida 4202 East Fowler Ave., CHE205 Tampa FL 33620 USAŁukasz WojtasDepartment of Chemistry University of South Florida 4202 East Fowler Ave., CHE205 Tampa FL 33620 USAWenqian XuX-ray Science Division Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USABrian SpaceDepartment of Chemistry University of South Florida 4202 East Fowler Ave., CHE205 Tampa FL 33620 USAMichael J. ZaworotkoDepartment of Chemical & Environmental Sciences University of Limerick Limerick Republic of IrelandPraveen K. ThallapallyPhysical and Computational Science Directorate Pacific Northwest National Laboratory Richland WA 99352 USA

2016en

ABI

Annotatsiya

The demand for Xe/Kr separation continues to grow due to the industrial significance of high-purity Xe gas. Current separation processes rely on energy intensive cryogenic distillation. Therefore, less energy intensive alternatives, such as physisorptive separation, using porous materials, are required. Herein we show that an underexplored class of porous materials called hybrid ultra-microporous materials (HUMs) affords new benchmark selectivity for Xe separation from Xe/Kr mixtures. The isostructural materials, CROFOUR-1-Ni and CROFOUR-2-Ni, are coordination networks that have coordinatively saturated metal centers and two distinct types of micropores, one of which is lined by CrO4 (2-) (CROFOUR) anions and the other is decorated by the functionalized organic linker. These nets offer unprecedented selectivity towards Xe. Modelling indicates that the selectivity of these nets is tailored by synergy between the pore size and the strong electrostatics afforded by the CrO4 (2-) anions.

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DOI: 10.1002/anie.201602287

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