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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei in a...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Enhanced resolution in proton solid-state NMR with very-fast MAS experiments.

Jean-Paul Amoureux1, Bingwen Hu, Julien Trébosc

  • 1UCCS (CNRS-8181), University of Lille-1, Fr-59652 Villeneuve d'Ascq, France. jean-paul.amoureux@univ-lille1.fr

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 27, 2008
PubMed
Summary

A new smooth amplitude-modulated (SAM) method enhances solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. This technique achieves highly resolved 1H spectra, particularly at fast magic angle spinning speeds.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Advanced Spectroscopic Techniques

Background:

  • Traditional NMR methods face limitations in spectral resolution.
  • Fast or ultra-fast magic angle spinning (MAS) speeds are crucial for high-resolution solid-state NMR.
  • Existing techniques like DUMBO and FSLG/PMLG have specific applications and limitations.

Purpose of the Study:

  • To introduce a novel smooth amplitude-modulated (SAM) method for solid-state NMR.
  • To enable observation of highly resolved 1H spectra.
  • To provide a complementary technique to existing advanced NMR sequences.

Main Methods:

  • Development of a new smooth amplitude-modulated (SAM) pulse sequence.
  • Application of the SAM method at fast or ultra-fast MAS speeds (nu(R) > 25 kHz).
  • Utilizes modern NMR consoles with fast electronics capable of smooth line-shape generation.

Main Results:

  • The SAM method achieves highly resolved 1H spectra in solid-state NMR.
  • The technique is robust and efficient, avoiding line-shape distortions and artifacts.
  • Demonstrates complementarity with existing methods like DUMBO, FSLG/PMLG, and symmetry-based sequences.

Conclusions:

  • The smooth amplitude-modulated (SAM) method is a valuable addition to solid-state NMR.
  • It offers superior spectral resolution, especially at high MAS frequencies.
  • Requires advanced console electronics, a limitation primarily at ultra-fast MAS regimes.