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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.2K
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...
1.2K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.9K
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...
1.9K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.1K
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...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.2K
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...
1.2K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Steering Room-Temperature Plexcitonic Strong Coupling: A Diexcitonic Perspective.

Wenbo Zhang1, Jia-Bin You2, Jingfeng Liu3

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China.

Nano Letters
|October 13, 2021
PubMed
Summary

This study demonstrates room-temperature diexcitonic strong coupling (DiSC) in a nanosystem, enabling ultrafast quantum manipulations. This breakthrough facilitates coherent energy transfer control for quantum computing applications.

Keywords:
Nano-opticsfull-quantum theoryplexcitonic strong couplingquantum plasmonics

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Area of Science:

  • Quantum physics
  • Nanotechnology
  • Materials science

Background:

  • Plexcitonic strong coupling enables nanoscale quantum manipulations.
  • Previous studies focused on homogeneous quantum emitters, limiting multiqubit applications.
  • Strong coupling with multiple excitons typically required very low temperatures.

Purpose of the Study:

  • To report a room-temperature diexcitonic strong coupling (DiSC) nanosystem.
  • To investigate coherent information exchange in a DiSC system with energy detuning.
  • To explore manipulation of plasmon-assisted coherent energy transfer.

Main Methods:

  • Fabrication of a nanosystem with a single Au nanocube coupled to a transition metal dichalcogenide monolayer and dye molecules.
  • Observation of strong coupling between plasmon-polaritons and two distinct excitons.
  • Characterization of coherent information exchange under varying exciton energy detuning and coupling strengths.

Main Results:

  • Achieved room-temperature diexcitonic strong coupling (DiSC) between a transition metal dichalcogenide monolayer, dye molecules, and a single Au nanocube.
  • Demonstrated coherent information exchange in the DiSC nanosystem with significant exciton energy detuning (5x linewidth).
  • Showcased tunability of strong coupling behaviors by adjusting plasmon resonance and coupling strengths.

Conclusions:

  • The developed DiSC nanosystem enables robust coherent energy transfer at room temperature.
  • This system offers a new paradigm for controlling plasmon-assisted energy transfer for quantum technologies.
  • The findings pave the way for multiqubit states in quantum computing and networking.