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Measurements of mot...
Abstract
Ämnesord
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- A novel MAS NMR approach is presented for the determination of heteronuclear dipolar couplings in unoriented materials. The technique is based on the proton-detected local field (PDLF) protocol, and achieves dipolar recoupling by R-type radio-frequency irradiation. The experiment, which is called R-PDLF spectroscopy, is demonstrated on solid and liquid-crystalline systems. For mobile systems, it is shown that the R-PDLF scheme provides better dipolar resolution as compared to techniques combining conventional separated local field (SLF) spectroscopy with R-type recoupling.
Nyckelord
- heteronuclear recoupling
- magic-angle spinning
- SLF
- PDLF
- R-type sequences
- solid-state nmr
- polarization transfer
- liquid-crystals
- cross-polarization
- hexaoctyloxy-rufigallol
- spinning conditions
- rotating solids
- columnar phases
- pulse sequences
- spectroscopy
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