Flexible ZIFs - probing guest-induced flexibility with CO2 , N2 and Ar adsorption

Noguera-Díaz, Antonio and Villarroel-Rocha, Jhonny and Ting, Valeska P and Bimbo, Nuno and Sapag, Karim and Mays, Timothy J (2019) Flexible ZIFs - probing guest-induced flexibility with CO2 , N2 and Ar adsorption. Journal of Chemical Technology and Biotechnology, 94 (12). pp. 3787-3792. ISSN 0268-2575

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Background The effect of framework topology on the guest‐induced flexibility of several crystalline zeolitic imidazolate frameworks (ZIF‐7, ZIF‐9, ZIF‐11 and ZIF‐12) was investigated via analysis of experimental N2, CO2 and Ar isotherms at 77 K (N2 and Ar) and 273 K (CO2) for gas pressures up to 0.13 MPa. Results The experimental isotherms were analysed in order to investigate structural flexibility of these materials using gases with kinetic diameters equal to or larger than the diameters of their static pore apertures. The results of gas sorption measurements indicate guest‐induced phase changes for ZIF‐7 and ZIF‐9 (SOD topologies). ZIF‐12 (RHO topology) also shows uptake for gases, despite its pore limiting diameter being smaller than the kinetic diameters of the adsorbed molecules. Conclusions This work highlights the ability of ZIFs with different framework topologies to change their structure and increase their pore aperture upon interaction with certain gases. These findings are key in the development of more selective ZIF‐based materials for important industrial applications including low‐energy gas separations, catalytic nanoreactors and sensor technology.

Item Type:
Journal Article
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Journal of Chemical Technology and Biotechnology
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This is the peer reviewed version of the following article: Noguera‐Díaz, A. , Villarroel‐Rocha, J. , Ting, V. P., Bimbo, N. , Sapag, K. and Mays, T. J. (2019), Flexible ZIFs: probing guest‐induced flexibility with CO2, N2 and Ar adsorption. Journal of Chemical Technology & Biotechnology . doi: 10.1002/jctb.5947 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/jctb.5947 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
?? gas adsorptionmofzifflexibilitybreathing structurenanomaterialsorganic chemistrychemical engineering(all)pollutionbiotechnologyinorganic chemistrywaste management and disposalfuel technologyrenewable energy, sustainability and the environment ??
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29 Jan 2019 12:05
Last Modified:
19 Mar 2024 00:38