Through-Bond Heteronuclear Single-Quantum Correlation Spectroscopy in Solid-State NMR, and Comparison to Other Through-Bond and Through-Space Experiments
✍ Scribed by Anne Lesage; Lyndon Emsley
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 78 KB
- Volume
- 148
- Category
- Article
- ISSN
- 1090-7807
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✦ Synopsis
A new through-bond carbon-proton correlation technique, the MAS-J-HSQC experiment, is described for solid-state NMR. This new pulse scheme is compared experimentally with the previously proposed MAS-J-HMQC experiment in terms of proton resolution on a model sample of powdered L-alanine. We show that for natural abundance compounds, the MAS-J-HMQC and MAS-J-HSQC experiments give about the same proton resolution, whereas, for 13 C-labeled materials, narrower proton linewidths are obtained with the MAS-J-HSQC experiment. In addition we show that in scalar as well as in dipolar heteronuclear shift correlation experiments, when the proton chemical shift is encoded by the evolution of a single-quantum coherence, the proton resolution can be enhanced by simply adding a 180°carbon pulse in the middle of the t 1 evolution time.