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Host-guest interaction of styrene and ethylbenzene in MIL-53 studied by solid-state NMR

Host-guest interaction of styrene and ethylbenzene in MIL-53 studied by solid-state NMR

Solid State Nuclear Magnetic Resonance 90: 1-6

Solid-state NMR was utilized to explore the host-guest interaction between adsorbate and adsorbent at atomic level to understand the separation mechanism of styrene (St) and ethylbenzene (EB) in MIL-53(Al). 13C-27Al double-resonance NMR experiments revealed that the host-guest interaction between St and MIL-53 was much stronger than that of EB adsorption. In addition, 13C DIPSHIFT experiments suggested that the adsorbed St was less mobile than EB confined inside the MIL-53 pore. Furthermore, the host-guest interaction model between St, EB and MIL-53 was established on the basis of the spatial proximities information extracted from 2D 1H-1H homo-nuclear correlation NMR experiments. According to the experimental observation from solid-state NMR, it was found that the presence of π-π interaction between St and MIL-53 resulted in the stronger host-guest interaction and less mobility of St. This work provides direct experimental evidence for understanding the separation mechanism of St and EB using MIL-53 as an adsorbent.

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Accession: 065200899

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PMID: 29316473

DOI: 10.1016/j.ssnmr.2017.12.004

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