Dynamic Nuclear Polarization
Enhanced Natural Abundance <sup>17</sup>O Spectroscopy
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Abstract
We show that natural abundance oxygen-17 NMR of solids
could be
obtained in minutes at a moderate magnetic field strength by using
dynamic nuclear polarization (DNP). Electron spin polarization could
be transferred either directly to <sup>17</sup>O spins or indirectly
via <sup>1</sup>H spins in inorganic oxides and hydroxides using an
oxygen-free solution containing a biradical polarization agent (bTbK).
The results open up a powerful method for rapidly acquiring high signal-to-noise
ratio solid-state NMR spectra of <sup>17</sup>O nuclear spins and
to probe sites on or near the surface, without the need for isotope
labeling