Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.5K
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...
2.5K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.4K
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 involved orbitals. The...
1.4K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.8K
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...
2.8K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.5K
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...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
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...
1.4K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

676
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
676

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Processing-driven chemical ordering and its effect on magnetic properties in a high entropy alloy.

Faraday discussions·2025
Same author

Does childhood TB or pneumonia impact COPD or asthma in adulthood?

The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease·2025
Same author

Lisfranc Injury: a Comprehensive Analysis of LongTerm Outcomes - the Oswestry Experience.

Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca·2025
Same author

A Systematic Review and Meta-Analysis of the Outcomes of Reconstruction with Vascularised vs Non-Vascularised Bone Graft after Surgical Resection of Primary Malignant and Non-Malignant Bone Tumors.

Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca·2024
Same author

A Systemic Review of Primary Malignant Long Bone Tumors in Children and Adolescents.

Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca·2024
Same author

Viscosupplementation with High Molecular Weight Hyaluronic Acid for Hip Osteoarthritis: a Systematic Review and Meta-Analysis of Randomised Control Trials of the Efficacy on Pain, Functional Disability, and the Occurrence of Adverse Events.

Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca·2024

Related Experiment Video

Updated: Dec 27, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

7.2K

Coupling between Exciton-Polariton Corner Modes through Edge States.

R Banerjee1, S Mandal1, T C H Liew1

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

Physical Review Letters
|February 29, 2020
PubMed
Summary
This summary is machine-generated.

Higher order topological insulators feature robust corner states for information storage. This study demonstrates nonlinear exciton polaritons can couple these corner states via edge states, enabling communication.

More Related Videos

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.9K
Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

8.9K

Related Experiment Videos

Last Updated: Dec 27, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

7.2K
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.9K
Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

8.9K

Area of Science:

  • Condensed matter physics
  • Topological materials
  • Quantum information science

Background:

  • Higher order topological insulators (HOTIs) exhibit unique topological properties.
  • Two-dimensional HOTIs host localized zero-dimensional corner modes within the band gap.
  • These corner modes are robust against disorder, making them promising for information trapping.

Purpose of the Study:

  • To address the challenge of information exchange between spatially separated corner states in 2D HOTIs.
  • To propose a novel mechanism for coupling topological corner modes using nonlinear optical phenomena.
  • To realize a system of multiple, connectible topological modes for potential quantum information applications.

Main Methods:

  • Utilizing an exciton polariton system, which combines properties of excitons and photons.
  • Employing nonlinear optical parametric scattering to mediate interactions.
  • Investigating the coupling between corner states through intermediate edge states.

Main Results:

  • Demonstrated nonlinear coupling between distinct topological corner modes.
  • Established a mechanism for information transfer between corner states via edge states.
  • Showcased the potential for creating interconnected topological modes in a controllable system.

Conclusions:

  • Nonlinear exciton polaritons offer a viable route to couple robust topological corner states.
  • This approach overcomes the limitation of isolated corner modes in 2D HOTIs.
  • The proposed system paves the way for novel topological quantum information processing platforms.