Nitrogen-14 NMR spectroscopy using residual dipolar splittings in solids.
It is shown that nuclear magnetic resonance (NMR) spectra of nitrogen-14 (spin I = 1) can be obtained by indirect detection in powders spinning at the magic angle (MAS). The method relies on the transfer of coherence from a neighboring nucleus with S = 1/2, such as carbon-13, to single- or double-quantum transitions of nitrogen-14 nuclei. The transfer of coherence occurs through second-order quadrupole-dipole cross terms, also known as residual dipolar splittings. The two-dimensional NMR spectra reveal powder patterns determined by the second-order quadrupolar interactions of nitrogen-14. Analysis of the spectra yields the quadrupolar coupling constant, CQ, and asymmetry parameter, etaQ, of nitrogen-14. These parameters can be related to the structure of nitrogen-containing solids.
Cavadini
Simone
S
Laboratoire de Résonance Magnétique Biomoléculaire, Ecole Polytechnique Fédérale de Lausanne, Batochime, CH-1015 Lausanne, Switzerland.
Lupulescu
Adonis
A
Antonijevic
Sasa
S
Bodenhausen
Geoffrey
G
D002247:Carbon Isotopes / Q000737:chemistry; D003903:Deuterium / Q000737:chemistry; D007554:Isotopes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009584:Nitrogen / Q000737:chemistry*; D009587:Nitrogen Isotopes / Q000737:chemistry; D010759:Phosphorus Isotopes / Q000737:chemistry; D013057:Spectrum Analysis
D002247:Carbon Isotopes; D007554:Isotopes; D009587:Nitrogen Isotopes; D010759:Phosphorus Isotopes; D003903:Deuterium; D009584:Nitrogen