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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics
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Chemical shift anisotropy selective inversion.

Marc A Caporini1, Christopher J Turner, Anthony Bielecki

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 4, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel technique to selectively reintroduce chemical shift anisotropy (CSA) in solid-state Nuclear Magnetic Resonance (NMR) by manipulating radio frequency fields. This method enhances spectral resolution and offers new possibilities for advanced NMR applications.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Magic Angle Spinning (MAS) is a crucial technique in solid-state NMR, primarily used to average out anisotropic interactions like chemical shift anisotropy (CSA).
  • While MAS simplifies spectra by removing broadening effects, it also eliminates valuable structural information encoded within the CSA.
  • There is a need for methods that can selectively manipulate or reintroduce anisotropic interactions to enhance spectral information and enable new NMR experiments.

Purpose of the Study:

  • To investigate a novel technique for selectively reintroducing chemical shift anisotropy (CSA) in solid-state NMR.
  • To develop a theoretical framework to describe the mechanism of CSA-selective transverse magnetization inversion.
  • To demonstrate the practical application and selectivity of this technique using numerical simulations and experimental data.

Main Methods:

  • Utilizing an amplitude sweep of the radio frequency (RF) field, specifically targeting multiples of the spinning frequency.
  • Developing a theoretical model to elucidate the spin dynamics and selectivity of the CSA inversion process.
  • Validating the theoretical predictions through numerical simulations and experimental solid-state NMR measurements.

Main Results:

  • Demonstrated successful selective inversion of transverse magnetization based on the magnitude of the chemical shift anisotropy (CSA).
  • The selectivity of the inversion was shown to be dependent on the size of the CSA, allowing for targeted manipulation.
  • The developed theoretical framework accurately describes the observed phenomenon.

Conclusions:

  • The proposed technique effectively reintroduces CSA information in MAS NMR, overcoming a limitation of standard MAS.
  • This CSA-selective inversion method, when combined with cross-polarization (CP), holds significant potential for developing advanced multi-dimensional MAS NMR experiments.
  • This approach offers new avenues for detailed structural and dynamic studies of solid materials.