Chemical exchange effects in the NMR spectra of rotating solids
- 15 October 1986
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 85 (8), 4248-4253
- https://doi.org/10.1063/1.451796
Abstract
We present a theoretical analysis based on Floquet theory describing the effect of intermediate rate exchange on line shapes in magic angle sample spinning (MASS) spectra. As a test case, 1 3C spectra were obtained of dimethyl sulfone (DMS) from 25–55 °C. DMS exhibits an axially symmetric powder pattern at 25 °C which becomes asymmetric due to 180° flips about the twofold axis bisecting the CH3–S–CH3 angle. As the temperature is increased, the principal effect on the MASS spectrum is a pronounced broadening of both the center and sidebands. Calculated spectra fit the experimental spectra well and provide information on the rate constants and the activation energy for the exchange process. These results extend the line shape methods successfully used to study molecular motion in static samples to include high resolution MASS.Keywords
This publication has 30 references indexed in Scilit:
- Solid-state carbon-13 NMR detection of a perturbed 6-s-trans chromophore in bacteriorhodopsinBiochemistry, 1985
- High-resolution carbon-13 NMR of retinal derivatives in the solid stateJournal of the American Chemical Society, 1985
- Carbon-13 chemical shift anisotropyProgress in Nuclear Magnetic Resonance Spectroscopy, 1984
- Sideband intensities in NMR spectra of samples spinning at the magic angleThe Journal of Chemical Physics, 1980
- NMR in rotating solidsThe Journal of Chemical Physics, 1979
- Carbon-13 nuclear magnetic resonance of polymers spinning at the magic angleJournal of the American Chemical Society, 1976
- Proton-enhanced NMR of dilute spins in solidsThe Journal of Chemical Physics, 1973
- Single Crystal Study of the 19F Shielding Tensors of a Trifluoromethyl GroupThe Journal of Chemical Physics, 1972
- Free Induction Decays of Rotating SolidsPhysical Review Letters, 1959
- Nuclear Magnetic Resonance Spectra from a Crystal rotated at High SpeedNature, 1958