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Default High-resolution NMR of hydrogen in organic solids by DNP enhanced natural abundance deuterium spectroscopy

From The DNP-NMR Blog:

High-resolution NMR of hydrogen in organic solids by DNP enhanced natural abundance deuterium spectroscopy


Rossini, A.J., et al., High-resolution NMR of hydrogen in organic solids by DNP enhanced natural abundance deuterium spectroscopy. J. Magn. Reson., 2015. 259: p. 192-198.


http://dx.doi.org/10.1016/j.jmr.2015.08.020


We demonstrate that high field (9.4 T) dynamic nuclear polarization (DNP) at cryogenic (~100 K) sample temperatures enables the rapid acquisition of natural abundance 1H–2H cross-polarization magic angle spinning (CPMAS) solid-state NMR spectra of organic solids. Spectra were obtained by impregnating substrates with a solution of the stable DNP polarizing agent TEKPol in tetrachloroethane. Tetrachloroethane is a non-solvent for the solids, and the unmodified substrates are then polarized through spin diffusion. High quality natural abundance 2H CPMAS spectra of histidine hydrochloride monohydrate, glycylglycine and theophylline were acquired in less than 2 h, providing direct access to hydrogen chemical shifts and quadrupolar couplings. The spectral resolution of the 2H solid-state NMR spectra is comparable to that of 1H spectra obtained with state of the art homonuclear decoupling techniques.


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