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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
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Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

948
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Dipolar Recoupling in Rotating Solids.

Vladimir Ladizhansky1, Ravi Shankar Palani2, Michael Mardini2

  • 1Biophysics Interdepartmental Group and Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada.

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|November 6, 2024
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This summary is machine-generated.

Magic angle spinning (MAS) nuclear magnetic resonance (NMR) techniques, particularly dipolar recoupling, are essential for analyzing biological macromolecules and materials. Advances in MAS NMR enhance structural and dynamic information retrieval.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology
  • Materials Science

Background:

  • Magic Angle Spinning (MAS) NMR has become indispensable for structural analysis of biomolecules and materials over the last 30 years.
  • Dipolar recoupling techniques are critical for acquiring detailed structural and dynamic insights using MAS NMR.

Purpose of the Study:

  • To review the development and applications of dipolar recoupling techniques in MAS NMR.
  • To explain the principles and spin dynamics of various homonuclear and heteronuclear recoupling methods.
  • To highlight recent advancements and their impact on biomolecular NMR and materials analysis.

Main Methods:

  • Discussion of homonuclear and heteronuclear dipolar recoupling sequences.
  • Explanation of spin dynamics generated by recoupling sequences.
  • Review of recent developments including high spinning frequency MAS, proton detection, and dynamic nuclear polarization.

Main Results:

  • Dipolar recoupling methods are essential for measuring spatial restraints in MAS NMR.
  • Advanced techniques significantly enhance resolution and sensitivity in MAS NMR spectroscopy.
  • The review provides a comprehensive overview of contemporary dipolar recoupling methods.

Conclusions:

  • Dipolar recoupling techniques are vital for structural biology and materials science applications of MAS NMR.
  • Emerging techniques promise further improvements in sensitivity and resolution for MAS NMR.
  • This review consolidates current knowledge and points towards future directions in MAS NMR research.