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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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Spin–Spin Coupling Constant: Overview01:08

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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

949
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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.3K
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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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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Related Experiment Video

Updated: Jun 11, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin-orbit entanglement driven by the Jahn-Teller effect.

Alejandro S Miñarro1, Mario Villa1, Blai Casals1,2

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Catalonia, Spain.

Nature Communications
|October 8, 2024
PubMed
Summary
This summary is machine-generated.

The Jahn-Teller effect in manganese (Mn3+) compounds enhances spin-orbit entanglement by reducing energy gaps. This synergistic interaction offers new pathways for exploring complex behaviors in 3d transition metal oxides.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state chemistry

Background:

  • Spin-orbit entanglement in 4d and 5d transition metals drives novel electronic properties.
  • Investigating spin-orbit entanglement in 3d compounds is challenging due to weaker spin-orbit coupling.

Purpose of the Study:

  • To demonstrate enhanced spin-orbit entanglement in 3d transition metal systems.
  • To explore the synergistic effects of Jahn-Teller and spin-orbit interactions.
  • To provide a method for entangling degrees of freedom in d-metal oxides.

Main Methods:

  • Investigated Jahn-Teller effect in Mn3+ compounds.
  • Analyzed the reduction of energy gaps between spin-orbital states.
  • Studied the interplay of orbital, lattice, and spin degrees of freedom.

Main Results:

  • The Jahn-Teller effect in Mn3+ significantly reduces the energy gap between high- and low- spin-orbital states.
  • This reduction leads to enhanced spin-orbit entanglement in 3d systems.
  • A rare synergistic effect between Jahn-Teller and spin-orbit interactions was observed.

Conclusions:

  • The Jahn-Teller effect can be leveraged to achieve enhanced spin-orbit entanglement in 3d transition metal oxides.
  • This work presents a novel approach to entangle orbital, lattice, and spin degrees of freedom.
  • Opens new avenues for exploring correlated electron systems with coupled degrees of freedom.