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Related Concept Videos

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...
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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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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...
1.3K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

957
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,...
957
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
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...
1.0K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
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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Updated: Jun 24, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Nonadiabatic Coupling-Induced Quantum Coherence in Two-Dimensional Materials.

Huan Yang1, Hao Dong1, Craig C Martens2

  • 1School of Physics, Shandong University, Jinan 250100, China.

The Journal of Physical Chemistry Letters
|June 10, 2024
PubMed
Summary
This summary is machine-generated.

We discovered quantum coherence and quantum beats in Al-doped blue phosphorene, driven by nonadiabatic coupling. This research enhances understanding and manipulation of quantum effects in low-dimensional materials for optoelectronic applications.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum mechanics

Background:

  • Two-dimensional materials exhibit unique quantum effects.
  • Electron-hole recombination in these materials is crucial for photocatalysis and optoelectronics.
  • Nonadiabatic coupling plays a role in quantum phenomena.

Purpose of the Study:

  • To investigate nonadiabatic coupling-induced quantum effects in Al-doped blue phosphorene.
  • To understand quantum coherence and quantum beats in this specific material system.
  • To explore new perspectives for utilizing nonadiabatic coupling in low-dimensional materials.

Main Methods:

  • Theoretical investigation of Al-doped blue phosphorene.
  • Analysis of electron-hole recombination dynamics.
  • Characterization of quantum coherence and quantum beats.

Main Results:

  • Observed nonadiabatic coupling-induced quantum coherence.
  • Detected quantum beats in Al-doped blue phosphorene.
  • Demonstrated the influence of Al-doping on these quantum phenomena.

Conclusions:

  • Al-doped blue phosphorene exhibits significant quantum coherence and quantum beats due to nonadiabatic coupling.
  • This work offers novel insights into nonadiabatic coupling in low-dimensional systems.
  • Findings provide guidance for engineering quantum coherence and enhancing optoelectronic properties.