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Related Concept Videos

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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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

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...
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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...
868
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

6.9K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Disentangling scalar coupling patterns by real-time SERF NMR.

Nina Gubensäk1, Walter M F Fabian, Klaus Zangger

  • 1Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria. klaus.zangger@uni-graz.at.

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Summary

This study introduces a new NMR experiment that isolates specific proton-proton couplings. This method simplifies complex spectra, enabling accurate measurement of scalar coupling constants for structural analysis.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) spectra provide crucial short-range structural data via scalar coupling constants and signal splitting.
  • Extracting these parameters from proton NMR ((1)H NMR) is challenging due to overlapping scalar coupling interactions.

Purpose of the Study:

  • To develop a high-resolution NMR experiment that selectively reveals scalar coupling to a single proton signal.
  • To eliminate all other couplings, simplifying spectral analysis.

Main Methods:

  • A real-time selectively refocused NMR experiment was designed.
  • This involved spatially selective homonuclear broadband decoupling.
  • Selective refocusing during data acquisition was employed.

Main Results:

  • The experiment successfully isolates scalar coupling interactions for a selected signal.
  • All other couplings are effectively removed from the NMR spectrum.
  • This allows for unperturbed extraction of scalar coupling constants.

Conclusions:

  • The presented NMR technique enables the precise determination of scalar coupling constants.
  • It overcomes limitations posed by complex, overlapping coupling patterns in (1)H NMR spectra.
  • This facilitates more accurate structural elucidation in organic chemistry.