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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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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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: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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

¹H NMR: Interpreting Distorted and Overlapping Signals

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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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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Related Experiment Video

Updated: May 4, 2026

Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy
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Improved decoupling during symmetry-based C9-TOBSY sequences.

Kong Ooi Tan1, Ingo Scholz1, Jacco D van Beek1

  • 1Physical Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 4, 2014
PubMed
Summary
This summary is machine-generated.

Phase-alternating pulse sequences (XiX) improve heteronuclear decoupling in C9 TOBSY NMR experiments. This method simplifies amplitude optimization and reduces radiofrequency field requirements for better performance.

Keywords:
DecouplingMagic-angle spinningSolid-state NMRTOBSY

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Quantum Control

Background:

  • Symmetry-based C9 TOBSY sequences are crucial for heteronuclear decoupling in NMR.
  • Continuous wave (cw) irradiation is a common but often suboptimal decoupling method.

Purpose of the Study:

  • To investigate the efficacy of phase-alternating pulse sequences (XiX) for enhancing heteronuclear decoupling in C9 TOBSY.
  • To compare the performance of XiX sequences with conventional cw irradiation.

Main Methods:

  • Utilized Floquet analysis to determine optimal timing for XiX sequences, avoiding interference with C9 TOBSY.
  • Employed analytical methods based on Floquet theory for performance analysis.
  • Verified findings through numerical simulations and experimental validation.

Main Results:

  • XiX sequences demonstrate improved heteronuclear decoupling performance compared to cw irradiation.
  • Optimization of decoupling radiofrequency (rf) field amplitude is simplified with XiX.
  • Lower rf field requirements are achieved with XiX for comparable decoupling performance.

Conclusions:

  • Phase-alternating XiX pulse sequences offer a superior alternative to cw irradiation for heteronuclear decoupling in C9 TOBSY.
  • The findings suggest practical advantages in NMR experiments due to simplified optimization and reduced power demands.