A novel dipolar dephasing method for the slow magic angle turning experiment.
Complete suppression of the resonances from protonated carbons in a slow magic angle spinning experiment can be achieved using five dipolar dephasing (Five-DD) periods distributed in one rotor period. This produces a spectrum containing only the spinning sidebands (SSB) from the nonprotonated carbons. It is shown that the SSB patterns corresponding to the nonprotonated carbons are not distorted over a wide range of dipolar dephasing times. Hence, this method can be used to obtain reliable principal values of the chemical shift tensors for each nonprotonated carbon. The Five-DD method can be readily incorporated into isotropic-anisotropic 2D experiments such as FIREMAT and 2D-PASS to facilitate the measurement of the (13)C chemical shift tensors in complex systems.
Hu
J Z
JZ
Department of Chemistry, University of Utah, Salt Lake City, 84112, USA.
Taylor
C M
CM
Pugmire
R J
RJ
Grant
D M
DM
D002247:Carbon Isotopes / Q000737:chemistry; D008279:Magnetic Resonance Imaging; D055585:Physical Phenomena; D010825:Physics; D012399:Rotation
D002247:Carbon Isotopes