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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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NMR Spectrometers: Resolution and Error Correction01:14

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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...
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Carbon-13 (¹³C) NMR: Overview01:10

Carbon-13 (¹³C) NMR: Overview

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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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Double Resonance Techniques: Overview01:12

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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

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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Accelerating quantitative 13C NMR spectra using an EXtended ACquisition Time (EXACT) method.

Zahra H Al-Aasmi1, Alexandra Shchukina2, Craig P Butts1

  • 1School of Chemistry, University of Bristol, Cantocks Close, Bristol, BS8 1TS, UK. craig.butts@bristol.ac.uk.

Chemical Communications (Cambridge, England)
|June 22, 2022
PubMed
Summary

Quantitative 13C NMR spectroscopy is accelerated using EXACT (EXtended ACquisition Time) methods. This technique reduces Nuclear Overhauser Enhancement (NOE), enabling 30-50% faster experiments for accurate results.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantitative Analysis
  • Spectroscopic Methods

Background:

  • Accurate quantitative 13C NMR is crucial for chemical analysis.
  • Traditional methods can be time-consuming.
  • Nuclear Overhauser Enhancement (NOE) can affect spectral intensity and quantitative accuracy.

Purpose of the Study:

  • To accelerate accurate quantitative 13C NMR spectroscopy.
  • To investigate the effectiveness of EXACT (EXtended ACquisition Time) NMR methods.
  • To reduce experiment times while maintaining quantitative accuracy.

Main Methods:

  • Utilized EXACT (EXtended ACquisition Time) NMR techniques.
  • Focused on reducing Nuclear Overhauser Enhancement (NOE) during the Free Induction Decay (FID).
  • Compared experiment times and quantitative accuracy with standard methods.

Main Results:

  • EXACT NMR methods significantly accelerate quantitative 13C NMR acquisition.
  • A reduction in NOE was observed during the FID.
  • Achieved 30-50% shorter experiment times for a given quantitative accuracy.

Conclusions:

  • EXACT NMR is an effective strategy for accelerating quantitative 13C NMR.
  • Reduced NOE leads to substantial time savings in NMR experiments.
  • This method enhances the efficiency of quantitative spectroscopic analysis.