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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...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on 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...
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Homonuclear dipolar decoupling schemes for fast MAS.

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

Solid State Nuclear Magnetic Resonance
|December 23, 2008
PubMed
Summary

We developed two robust one-dimensional methods for observing highly resolved proton (1H) spectra in solid-state Nuclear Magnetic Resonance (NMR). These techniques are efficient and minimize false signals, enhancing spectral clarity.

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Last Updated: Jun 26, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Materials characterization using magnetic resonance techniques.

Background:

  • Direct observation of proton (1H) spectra in solid-state NMR is challenging.
  • High magic angle spinning (MAS) speeds are often required for spectral resolution.

Purpose of the Study:

  • To present novel one-dimensional methods for direct observation of highly resolved 1H spectra in solid-state NMR.
  • To develop robust and efficient NMR techniques for improved spectral analysis.

Main Methods:

  • Development and application of two novel one-dimensional NMR methods.
  • Utilizing magic angle spinning (MAS) speeds of 30-35 kHz.
  • Implementation of a windowed smooth amplitude-modulated (wSAM) pulse sequence.

Main Results:

  • Achieved direct observation of highly resolved 1H spectra.
  • Demonstrated robustness and efficiency of the presented methods.
  • Observed very few false resonances, indicating high spectral purity.

Conclusions:

  • The developed methods enable direct and clear observation of 1H spectra in solid-state NMR.
  • The wSAM method shows potential for ultra-fast MAS, pending electronic capabilities.
  • These techniques offer significant improvements for solid-state NMR spectral analysis.