Facile proton conduction via ordered water molecules in a phosphonate metal-organic framework

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DOIResolve DOI: http://doi.org/10.1021/ja107035w
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TypeArticle
Journal titleJournal of the american chemical society
Volume132
Issue40
Pages1405514057; # of pages: 3
AbstractA new phosphonate metal-organic framework (MOF) with a layered motif but not that of the classical hybrid inorganic-organic solid is presented. Zn3(L)(H2O)2 ·2H2O (L ) [1,3,5-benzenetriphosphonate]6-), henceforth denoted as PCMOF-3, contains a polar interlayer lined with Zn-ligated water molecules and phosphonate oxygen atoms. These groups serve to anchor free water molecules into ordered chains, as observed by X-ray crystallography. The potential for proton conduction via the well-defined interlayer was studied by 2H solid-state NMR spectroscopy and AC impedance spectroscopy. The proton conductivity in H2 was measured as 3.5 × 10-5 S cm-1 at 25 °C and 98% relative humidity. More interestingly, an Arrhenius plot gave a low activation energy of 0.17 eV for proton transfer, corroborating the solid-state NMR data that showed exchange between all deuterium sites in the D2O analogue of PCMOF-3, even at -20 °C.
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number17673472
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Record identifier607c87e8-cf43-47c0-8ac4-f42e25edfdcd
Record created2011-04-01
Record modified2016-05-09
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