Dynamic Nuclear Polarization Enhanced Natural Abundance 17O Spectroscopy

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• 作者：Fr茅d茅ric Blanc ; Luke Sperrin ; David A. Jefferson ; Shane Pawsey ; Melanie Rosay ; Clare P. Grey
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：February 27, 2013
• 年：2013
• 卷：135
• 期：8
• 页码：2975-2978
• 全文大小：279K
• 年卷期：v.135,no.8(February 27, 2013)
• ISSN：1520-5126

文摘

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 ¹⁷O spins or indirectly via ¹H 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 ¹⁷O nuclear spins and to probe sites on or near the surface, without the need for isotope labeling.