Two-dimensional Pure Isotropic Proton Solid State NMR
One key bottleneck of solid-state NMR spectroscopy is that H-1 NMR spectra of organic solids are often very broad due to the presence of a strong network of dipolar couplings. We have recently suggested a new approach to tackle this problem. More specifically, we parametrically mapped errors leading to residual dipolar broadening into a second dimension and removed them in a correlation experiment. In this way pure isotropic proton (PIP) spectra were obtained that contain only isotropic shifts and provide the highest H-1 NMR resolution available today in rigid solids. Here, using a deep-learning method, we extend the PIP approach to a second dimension, and for samples of L-tyrosine hydrochloride and ampicillin we obtain high resolution H-1-H-1 double-quantum/single-quantum dipolar correlation and spin-diffusion spectra with significantly higher resolution than the corresponding spectra at 100 kHz MAS, allowing the identification of previously overlapped isotropic correlation peaks.
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Moutzouri, P., Cordova, M., de Almeida, B. S., Torodii, D., & Emsley, L. (2023). Two-dimensional Pure Isotropic Proton Solid State NMR. Angewandte Chemie International Edition, 62(21), Article e202301963. https://doi.org/10.1002/anie.202301963
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WOS:000974684100001
2023-04-18
62
21
e202301963
REVIEWED
EPFL