Measurements of motionally averaged heteronuclear dipolar couplings in MAS NMR using R-type recoupling
2004 (English)In: Journal of magnetic resonance (San Diego, Calif. 1997: Print), ISSN 1090-7807, E-ISSN 1096-0856, Vol. 168, no 2, 194-201 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2004. Vol. 168, no 2, 194-201 p.
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
IdentifiersURN: urn:nbn:se:kth:diva-23444DOI: 10.1016/j.jmr.2004.03.001ISI: 000221650200002OAI: oai:DiVA.org:kth-23444DiVA: diva2:342142
QC 201005252010-08-102010-08-10Bibliographically approved