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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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

NMR Spectroscopy: Spin–Spin Coupling

2.9K
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...
2.9K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

2.4K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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...
1.4K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.4K
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...
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Attenuating Multispin Contributions during Selective Proton-Proton Distance Measurements in Magic Angle Spinning NMR.

Lokeswara Rao Potnuru1, Shubhangi Arora1,2, Matthias Ernst3

  • 1Tata Institute of Fundamental Research Hyderabad, Sy. No. 36/P, Gopanpally, Ranga Reddy District, Hyderabad 500 046, India.

The Journal of Physical Chemistry Letters
|December 5, 2025
PubMed
Summary

We developed isotropic chemical shift-amplified selective recoupling of protons (iCSA-SERP) to improve proton-proton distance measurements in solid-state NMR. This method enhances selectivity, overcoming challenges from complex spin interactions in protonated solids.

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Area of Science:

  • Solid-state nuclear magnetic resonance (NMR) spectroscopy
  • Materials science
  • Structural biology

Background:

  • Accurate interproton distance measurements in solid-state NMR are crucial for atomic-level structural determination.
  • Multispin effects and homogeneous coupling in fully protonated solids present significant challenges for existing techniques.
  • Current methods like spin diffusion and selective recoupling of protons (SERP) are limited by spin-bath interference.

Purpose of the Study:

  • To introduce and validate a novel method, isotropic chemical shift-amplified SERP (iCSA-SERP), for enhanced spin-pair selectivity in solid-state NMR.
  • To improve the accuracy of 1H-1H distance measurements in complex, protonated spin systems.
  • To overcome limitations posed by homogeneous spin coupling and multispin effects.

Main Methods:

  • Derivation of the effective Hamiltonian using bimodal Floquet theory to analyze the iCSA-SERP recoupling mechanism.
  • Computational simulations at high magnetic fields (e.g., 1200 MHz) to assess performance and distance extraction.
  • Experimental validation using protonated model systems (NAV and f-MLF) to confirm measurement accuracy.

Main Results:

  • iCSA-SERP demonstrates significantly enhanced spin-pair selectivity by amplifying isotropic chemical shift evolution.
  • Simulations show improved distance extraction in the 2-4 Å range with reduced spin-bath interference.
  • Experimental results in NAV and f-MLF validate the theoretical predictions and show improved measurement accuracy.

Conclusions:

  • iCSA-SERP provides a robust and accurate method for precise interproton distance measurements in dense spin networks.
  • The technique is particularly effective at high magnetic fields, offering new possibilities for structural studies of challenging materials.
  • This advancement facilitates more detailed atomic-level structural insights in solid-state NMR.