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Facile Proton Conduction via Ordered Water Molecules in a Phosphonate Metal−Organic Framework
Abstract
A new phosphonate metal-organic framework (MOF) with a layered motif but not that of the classical hybrid inorganic-organic solid is presented. Zn(3)(L)(H(2)O)(2)·2H(2)O (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 (2)H solid-state NMR spectroscopy and AC impedance spectroscopy. The proton conductivity in H(2) 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 D(2)O analogue of PCMOF-3, even at -20 °C.
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Metadata
- Authors
- Taylor, J. M., Mah, R. K., Moudrakovski, I. L., Ratcliffe, C. I., Vaidhyanathan, R., & Shimizu, G. K. H.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-09-21
- Volume
- 132
- Issue
- 40
- Pages
- 14055-14057
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2061097480
- Cited by
- 414
- References
- 20
- FWCI
- 17.67
- Type
- journal article
- Language
- en
- Open access
- closed
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