title: Measurements of motionally averaged heteronuclear dipolar couplings in MAS NMR using R-type recoupling.
abstract: 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.
authors.affiliation: Division of Physical Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden. sergey@physc.su.se
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Dvinskikh
authors.forename: Herbert
authors.initials: H
authors.lastname: Zimmermann
authors.forename: Arnold
authors.initials: A
authors.lastname: Maliniak
authors.forename: Dick
authors.initials: D
authors.lastname: Sandström
mesh_terms: D000409:Alanine / Q000737:chemistry*; D002247:Carbon Isotopes; D005998:Glycine / Q000737:chemistry*; D008958:Models, Molecular; D009038:Motion; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011522:Protons; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013113:Spin Labels
chemical_list: D002247:Carbon Isotopes; D011522:Protons; D013113:Spin Labels; D000409:Alanine; D005998:Glycine