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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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

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

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 others.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Pseudomultidimensional NMR by spin-state selective off-resonance decoupling.

Christy Rani R Grace1, Roland Riek

  • 1Structural Biology Laboratory, The Salk Institute, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|December 18, 2003
PubMed
Summary

This study introduces spin-state selective off-resonance decoupling for precise chemical shift monitoring in multidimensional NMR. This method enhances spectral resolution and avoids overlap issues in complex nuclear magnetic resonance experiments.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology
  • Chemical Physics

Background:

  • Accurate chemical shift measurement is crucial for multidimensional NMR.
  • Traditional methods can suffer from overlap and require complex pulse sequences.
  • Off-resonance decoupling is a known technique but has limitations.

Purpose of the Study:

  • To present an alternate technique for accurate chemical shift monitoring in multidimensional NMR.
  • To introduce spin-state selective off-resonance decoupling.
  • To improve spectral resolution and avoid overlap issues.

Main Methods:

  • Applying off-resonance decoupling on spin S during acquisition of spin I.
  • Scaling scalar coupling J(I,S) so residual coupling is a function of spin S chemical shift.
  • Utilizing spin-state selection to detect doublet components and create subspectra.

Main Results:

  • Chemical shift information of spin S is indirectly retained without extra evolution periods.
  • Accurate measurement of residual scalar coupling and precise chemical shift values are obtained.
  • Spin-state selection yields two subspectra, avoiding overlap problems.

Conclusions:

  • Spin-state selective off-resonance decoupling can be incorporated into any NMR pulse sequence.
  • Applied to 3D (13)C or (15)N-resolved [(1)H,(1)H]-NOESY, it creates pseudo-4D spectra.
  • This method significantly increases chemical shift resolution (1-2 orders of magnitude) compared to standard 4D NMR.