Abstract
A three-dimensional nuclear magnetic resonance (NMR) experiment is described for the investigation of molecular rearrangements in the course of chemical exchange processes. The experiment relies on the two-dimensional correlation of the chemical shift tensors before and after exchange. The chemical shift tensors are retrieved under fast magic angle spinning by rotary resonance induced by a radio-frequency field whose magnitude matches the sample spinning frequency. The third dimension serves for the separation of the two-dimensional chemical shift patterns by the isotropic chemical shifts. The three-dimensional rotary-resonance C13-exchange experiment is demonstrated with an investigation of hydrogen-transfer and molecular diffusion processes in a sample of solid tropolone.
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