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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.
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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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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.
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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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.
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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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A Versatile Broadband Attached Proton Test Experiment for Routine 13C Nuclear Magnetic Resonance Spectroscopy.

Peter Bigler1, Ilche Gjuroski1, Dib Chakif1

  • 1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.

Molecules (Basel, Switzerland)
|February 24, 2024
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Summary

A new broadband attached proton test sequence simplifies recording 13C nuclear magnetic resonance spectra. This method enhances spectral editing and quaternary-carbon analysis for small molecules, especially in high-throughput settings.

Keywords:
13C1H1JCH-toleranceAPTCq-onlyNMRbroadband APT

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Area of Science:

  • Chemistry
  • Analytical Chemistry
  • Spectroscopy

Background:

  • 13C Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for analyzing small molecules.
  • Existing attached proton test (APT) experiments have limitations in handling diverse coupling constants and suppressing unwanted signals.
  • Efficient spectral editing and isolation of quaternary carbons are essential for detailed molecular analysis.

Purpose of the Study:

  • To introduce a novel broadband attached proton test (BBAPT) sequence for 13C NMR.
  • To demonstrate the BBAPT sequence's ability to easily record multiplicity-edited and quaternary-carbon-only spectra.
  • To highlight the BBAPT sequence's advantages over previous APT methods for small molecule analysis.

Main Methods:

  • Development and implementation of a broadband attached proton test pulse sequence.
  • Acquisition and analysis of 13C NMR spectra using the proposed sequence.
  • Comparison of BBAPT performance with existing APT experiments regarding signal suppression and coupling constant tolerance.

Main Results:

  • The BBAPT sequence allows for straightforward recording of both multiplicity-edited and quaternary-carbon-only 13C NMR spectra.
  • It maintains tolerance for a wide range of one-bond C-H coupling constants.
  • Effective suppression of residual CHn signals in quaternary-carbon-only spectra is achieved.

Conclusions:

  • The broadband attached proton test sequence offers an efficient and user-friendly method for 13C NMR spectral editing.
  • Its robustness and ease of use make it highly suitable for the analysis of small molecules.
  • The BBAPT experiment is particularly valuable for high-throughput laboratories requiring detailed spectral information.