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Default Probing Surface Hydrogen Bonding and Dynamics by Natural Abundance, Multidimensional,17O DNP-NMR Spectroscopy #DNPNMR

From The DNP-NMR Blog:

Probing Surface Hydrogen Bonding and Dynamics by Natural Abundance, Multidimensional,17O DNP-NMR Spectroscopy #DNPNMR

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Perras, F.A., et al., Probing Surface Hydrogen Bonding and Dynamics by Natural Abundance, Multidimensional,17O DNP-NMR Spectroscopy. The Journal of Physical Chemistry C, 2016. 120(21): p. 11535-11544.


http://dx.doi.org/10.1021/acs.jpcc.6b02579


Dynamic nuclear polarization (DNP)-enhanced solid-state nuclear magnetic resonance (SSNMR) spectroscopy is increasingly being used as a tool for the atomic-level characterization of surface sites. DNP surface-enhanced SSNMR spectroscopy of materials has, however, been limited to studying relatively receptive nuclei, and the particularly rare 17O nuclide, which is of great interest for materials science, has not been utilized. We demonstrate that advanced 17O SSNMR experiments can be performed on surface species at natural isotopic abundance using DNP. We use 17O DNP surface-enhanced 2D SSNMR to measure 17O{1H} HETCOR spectra as well as dipolar oscillations on a series of thermally treated mesoporous silica nanoparticle samples having different pore diameters. These experiments allow for a nonintrusive and unambiguous characterization of hydrogen bonding and dynamics at the surface of the material; no other single experiment can give such details about the interactions at the surface. Our data show that, upon drying, strongly hydrogen-bonded surface silanols, whose motions are greatly restricted by the interaction when compared to lone silanols, are selectively dehydroxylated.
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