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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Noninvasive Substitution of K + Sites in Cyclodextrin Metal-Organic Frameworks by Li + Ions.
Journal of the American Chemical Society 2017 August 17
Co-crystallization of K+ and Li+ ions with γ-cyclodextrin (γ-CD) has been shown to substitute the K+ ion sites partially by Li+ ions, while retaining the structural integrity and accessible porosity of CD-MOF-1 (MOF, metal-organic framework). A series of experiments, in which the K+ /Li+ ratio was varied with respect to that of γ-CD, have been conducted in order to achieve the highest possible proportion of Li+ ions in the framework. Attempts to obtain a CD-MOF containing only Li+ ions resulted in nonporous materials. The structural occupancy on the part of the Li+ ions in the new CD-MOF has been confirmed by single-crystal X-ray analysis by determining the vacancies of K+ -ion sites and accounting for the cation/γ-CD ratio in CD-MOF-1. The proportion of Li+ ions has also been confirmed by elemental analysis, whereas powder X-ray diffraction has established the stability of the extended framework. This noninvasive synthetic approach to generating mixed-metal CD-MOFs is a promising method for obtaining porous framework unattainable de novo. Furthermore, the CO2 and H2 capture capacities of the Li+ -ion-substituted CD-MOF have been shown to exceed the highest sorption capacities reported so far for CD-MOFs.
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