In Situ Monitoring of Unique Switching Transitions in the Pressure-Amplifying Flexible Framework Material DUT-49 by High-Pressure 129Xe NMR Spectroscopy

Schaber J, Krause S, Paasch S, Senkovska I, Bon V, Toebbens DM, Wallacher D, Kaskel S, Brunner E (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 121

Pages Range: 5195-5200

Journal Issue: 9

DOI: 10.1021/acs.jpcc.7b01204

Abstract

The pronounced flexibility of special metal-organic frameworks (MOFs), so-called soft porous crystals, is attracting increasing research interest. Studies of host-guest interactions in such materials are especially powerful if the measurements are performed in situ. 129Xe NMR spectroscopy is favorable because it provides characteristic, structure-sensitive parameters such as chemical shifts. The combination of high-pressure xenon adsorption with 129Xe NMR spectroscopy was used to elucidate the adsorption-induced phase transitions in the recently discovered pressure-amplifying framework material DUT-49, showing a unique negative gas adsorption (NGA) transition. In the open-pore state, DUT-49op exhibits a hierarchical pore system involving both micro- and mesopores. After reaching a critical relative pressure of ca. 0.15, adsorbed xenon induces mesopore contraction, resulting in a purely microporous contracted-pore phase. This contraction is accompanied by release of xenon from the mesopores. Further increase of the pressure initiates the recovery of the mesopores without any indication of a structural intermediate in the NMR spectra. According to the NMR data, the structural transition induced by xenon is a collective, stepwise phenomenon rather than a continuous process. This is the first time that NGA has been studied by directly monitoring the guest and its interaction with the host framework. (Graph Presented).

Involved external institutions

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) DE Germany (DE) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Schaber, J., Krause, S., Paasch, S., Senkovska, I., Bon, V., Toebbens, D.M.,... Brunner, E. (2017). In Situ Monitoring of Unique Switching Transitions in the Pressure-Amplifying Flexible Framework Material DUT-49 by High-Pressure 129Xe NMR Spectroscopy. Journal of Physical Chemistry C, 121(9), 5195-5200. https://doi.org/10.1021/acs.jpcc.7b01204

MLA:

Schaber, Jana, et al. "In Situ Monitoring of Unique Switching Transitions in the Pressure-Amplifying Flexible Framework Material DUT-49 by High-Pressure 129Xe NMR Spectroscopy." Journal of Physical Chemistry C 121.9 (2017): 5195-5200.

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