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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

870
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...
870
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.7K
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...
1.7K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.4K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.3K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.5K

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Related Experiment Video

Updated: May 3, 2026

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

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Enhancing spin coherence times in solid-state NMR using tailored heteronuclear spin decoupling.

Zeba Qadri1, Kaustubh R Mote2, Perunthiruthy K Madhu2

  • 1Center for Quantum and Topological Systems, New York University Abu Dhabi, United Arab Emirates.

Progress in Nuclear Magnetic Resonance Spectroscopy
|May 1, 2026
PubMed
Summary
This summary is machine-generated.

Solid-state NMR requires efficient proton decoupling for high-resolution spectra. Refocused continuous-wave (rCW) decoupling methods, especially rCW^ApA, offer superior robustness and efficiency for structural studies of biomolecules.

Keywords:
Floquet theoryMagic-angle spinningSolid-state NMRSpin decouplingSupercyclingTPPMrCW

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Area of Science:

  • Solid-state nuclear magnetic resonance (ssNMR) spectroscopy
  • Structural biology
  • Magnetic resonance spectroscopy

Background:

  • High spectral resolution is essential for ssNMR structural studies of biomolecules.
  • Efficient heteronuclear spin decoupling is critical for resolving 13C or 15N spectra, especially with abundant 1H spins.
  • Traditional decoupling methods like CW, TPPM, and XiX have limitations in parameter tolerance and optimization.

Purpose of the Study:

  • To review key heteronuclear decoupling methods in ssNMR.
  • To highlight the advantages of refocused continuous-wave (rCW) decoupling and its variants.
  • To provide insights for designing improved decoupling strategies for enhanced ssNMR sensitivity and resolution.

Main Methods:

  • Review of existing and novel decoupling schemes, including continuous-wave (CW), two-pulse phase-modulated (TPPM), X-inverse-X (XiX), refocused continuous-wave (rCW), and phase-alternated rCW (rCW^ApA).
  • Presentation of experimental and numerical results comparing decoupling efficiencies.
  • Theoretical analysis of heteronuclear and homonuclear dipole-dipole coupling interactions under RF irradiation.

Main Results:

  • rCW decoupling methods demonstrate superior robustness to variations in RF field amplitude, offset, and magic angle spinning (MAS) frequency.
  • The rCW^ApA method offers enhanced resolution and robustness due to improved cancellation of residual dipole-dipole couplings.
  • rCW methods provide efficient decoupling across a wide range of MAS frequencies (8 kHz to 100 kHz).

Conclusions:

  • rCW and its variants represent significant advancements in ssNMR decoupling, enabling high-resolution spectra from challenging samples.
  • These methods minimize optimization time and complexity, facilitating broader application in structural biology.
  • Further development of decoupling strategies can enhance ssNMR sensitivity and resolution for biomolecular studies.