Friday, June 09, 2006

JACS, Bodenhausen, indirect detection of 14N spectra via residual dipolar coupling - similar to Gan's work?

J. Am. Chem. Soc., ASAP Article 10.1021/ja0618898 S0002-7863(06)01889-0
Web Release Date: May 26, 2006

Nitrogen-14 NMR Spectroscopy Using Residual Dipolar Splittings in Solids

Simone Cavadini, Adonis Lupulescu, Sasa Antonijevic,* and Geoffrey Bodenhausen

Laboratoire de Résonance Magnétique Biomoléculaire, Ecole Polytechnique Fédérale de Lausanne, Batochime, CH-1015 Lausanne, Switzerland, and Département de Chimie, associé au CNRS, Ecole Normale Supérieure, 24 rue Lhomond 75231, Paris Cedex 05, France


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.

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