Dynamic nuclear polarization at 40 kHz magic angle spinning.
Dynamic nuclear polarization at 40 kHz magic angle spinning.
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DOI:
10.1039/c6cp00839a
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发表时间:
2016-04-21
期刊:
影响因子:
--
通讯作者:
Emsley L
中科院分区:
文献类型:
--
作者:
Chaudhari SR;Berruyer P;Gajan D;Reiter C;Engelke F;Silverio DL;Copéret C;Lelli M;Lesage A;Emsley L
DNP-enhanced solid-state NMR spectroscopy is shown to maintain performance over a wide range of sample spinning rates up to 40 kHz. DNP-enhanced solid-state NMR spectroscopy under magic angle spinning (MAS) is rapidly developing into a powerful analytical tool to investigate the structure of a wide range of solid materials, because it provides unsurpassed sensitivity gains. Most developments and applications of DNP MAS NMR were so far reported at moderate spinning frequencies (up to 14 kHz using 3.2 mm rotors). Here, using a 1.3 mm MAS DNP probe operating at 18.8 T and ∼100 K, we show that signal amplification factors can be increased by up to a factor two when using smaller volume rotors as compared to 3.2 mm rotors, and report enhancements of around 60 over a range of sample spinning rates from 10 to 40 kHz. Spinning at 40 kHz is also shown to increase 29Si coherence lifetimes by a factor three as compared to 10 kHz, substantially increasing sensitivity in CPMG type experiments. The contribution of quenching effects to the overall sensitivity gain at very fast MAS is evaluated, and applications are reported on a functionalised mesostructured organic–inorganic material.
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