Flexible ZIFs: Probing guest‐induced flexibility with CO2, N2 and Ar adsorption

BACKGROUND: The effect of framework topology on the guest-induced flexibility of several crystalline zeolitic imidazolateframeworks (ZIF-7, ZIF-9, ZIF-11 and ZIF-12) was investigated via analysis of experimental nitrogen (N2), carbon dioxide (CO2)and argon (Ar) isotherms at 77 K (N2 and Ar) and 273...

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Detalhes bibliográficos
Autores: Noguera Díaz, Antonio, Villarroel Rocha, Jhonny, Ting, Valeska P., Bimbo, Nuno, Sapag, Manuel Karim, Mays, Timothy J.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/118727
Acesso em linha:http://hdl.handle.net/11336/118727
Access Level:acceso abierto
Palavra-chave:GAS ADSORPTION
MOF
ZIF
FLEXIBILITY
BREATHING STRUCTURE
NANOMATERIALS
https://purl.org/becyt/ford/2.10
https://purl.org/becyt/ford/2
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.3
Descrição
Resumo:BACKGROUND: The effect of framework topology on the guest-induced flexibility of several crystalline zeolitic imidazolateframeworks (ZIF-7, ZIF-9, ZIF-11 and ZIF-12) was investigated via analysis of experimental nitrogen (N2), carbon dioxide (CO2)and argon (Ar) isotherms at 77 K (N2 and Ar) and 273 K (CO2) for gas pressures up to 0.13MPa. RESULTS: The experimental isotherms of these frameworkswere analysed in order to investigate their structural flexibility usinggases with kinetic diameters equal to or larger than the diameters of their static pore apertures. The results of gas sorptionmeasurements indicate guest-induced phase changes for ZIF-7 and ZIF-9 (SOD topologies). ZIF-12 (RHO topology) also showsuptake 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 structureandincrease their pore apertureuponinteraction with certain gases.These findings are key in thedevelopment ofmore selectiveZIF-basedmaterials for important industrial applications including low-energy gas separations, catalytic nanoreactors and sensortechnology.

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