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- Title
Investigating adsorption of organic compounds in metal-organic framework MIL-53.
- Authors
Ibrahim, Balsam; Lucier, Bryan E. G.; Jun Xu; Peng He; Yining Huang
- Abstract
Metal-organic frameworks (MOFs) are versatile materials that incorporate metal centers along with organic linkers in highly ordered, intricate structures. MIL-53 is a MOF that exhibits a "breathing effect," where the pore size and MOF topology are profoundly influenced by the identity and binding mechanism of guest molecules. This phenomenon renders MIL-53 a promising candidate for sensing applications. In this report, the adsorption of various organic compounds within MIL-53 is investigated using a combination of complementary techniques. Thermal gravimetric analysis experiments confirm loading of the guest molecules and yield insight into adsorption interactions and strengths. Significant guest-induced changes in the crystal structure of MIL-53 are revealed by powder X-ray diffraction experiments; specific unique phases of MIL-53 are related to the identity of the guest molecule and its binding mechanism to the framework. 27Al and 13C solid-state NMR experiments probe the interaction between guest molecules and MIL-53. The relationship between the nature of the guest, the structure of MIL-53, and 27Al NMR parameters is explored. 27Al NMR parameters are sensitive to the host-guest binding mechanism (i.e., hydrogenbonding or π-π stacking interactions) and yield valuable information regarding the influence of the adsorbates on the local aluminum environment. This combination of physical characterization techniques is a useful probe of guest adsorption and the breathing effect within MIL-53 and should prove useful for investigation of related MOFs.
- Subjects
ORGANIC compounds; ADSORPTION (Chemistry); METAL-organic frameworks; THERMOGRAVIMETRY; HOST-guest chemistry
- Publication
Canadian Journal of Chemistry, 2015, Vol 93, Issue 9, p960
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2014-0598