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Advances in FT-NMR Methodology for Paramagnetic Solutions: Detection of Quadrupolar Nuclei in Complex Free Radicals and Biological Samples

  • N. S. Dalal

Abstract

This chapter reviews our recent studies aimed at developing the FT-NMR method as a “beat-relaxation” technique which permits the detection of fast-relaxing spins such as quadrupolar nuclei in paramagnetic solutions. The technique is termed “beat relaxation” since the FT-NMR method takes advantage of the short spin-lattice relaxation times (<10–11 sec) whereas fast relaxation renders other paramagnetic resonance techniques unsuitable for detecting such species. Our primary focus will be on measuring small (≤ 1 Gauss) hyperfine (hf) couplings from quadrupolar nuclei in large organic radicals in solution where such measurements have been feasible for the first time. The significance of the FT-NMR advances may be gauged from the fact that measurements of small 14N couplings in free radicals had previously not been possible despite the use of EPR, conventional NMR, electron-nuclear double-resonance (ENDOR),1,2 electron-electron double-resonance (ELDOR),1,2 and electron-nuclear triple resonance.3

Keywords

Triple Resonance Quadrupolar Nucleus Contact Shift Observe Line Width Fast Relaxation Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1982

Authors and Affiliations

  • N. S. Dalal
    • 1
  1. 1.Chemistry DepartmentWest Virginia UniversityMorgantownUSA

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