Superprotonic Conductivity of MOF-808 Achieved by Controlling the Binding Mode of Grafted Sulfamate.
Angew Chem Int Ed Engl
; 60(26): 14334-14338, 2021 06 21.
Article
em En
| MEDLINE
| ID: mdl-33960088
ABSTRACT
A metal-organic framework (MOF) having superprotonic conductivity, MOF-808, is prepared by modulating the binding mode of the sulfamate (SA) moieties grafted onto the metal clusters. The activation of the SA-grafted MOF-808 at 150 °C changes the binding mode of the grafted SA from monodentate to bridging bidentate, thus converting the neutral amido (-S-NH2 ) moiety of the grafted SA to the more acidic cationic sulfiliminium (-S=NH2+ ) moiety. Further, the acidic sulfiliminium moiety of MOF-808-4SA-150 results in more efficient proton conduction than the amido moiety of MOF-808-4SA-60. At 60 °C and 95 % relative humidity, MOF-808-4SA-150 is found to have a proton conductivity of 7.89×10-2 â
S cm-1 , which is more than 30-times higher than that of MOF-808-4SA-60. Moreover, this superprotonic conductivity is well maintained over 1000â
cycles of conductivity measurements and for similar cyclic measurements each day for seven days.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article