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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
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...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

959
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...
959
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K
Colors and Magnetism03:02

Colors and Magnetism

11.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Related Experiment Video

Updated: Jul 18, 2025

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Correction: Multiple correlations between spin crossover and fluorescence in a dinuclear compound.

Chun-Feng Wang1,2, Ming-Jun Sun1, Qi-Jie Guo1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China. zxcao@xmu.edu.cn.

Chemical Communications (Cambridge, England)
|August 23, 2023
PubMed
Summary
This summary is machine-generated.

This correction clarifies the spin crossover and fluorescence correlations in a dinuclear compound. The study details multiple relationships between these properties in the investigated material.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Context:

  • Investigates dinuclear metal complexes exhibiting spin crossover (SCO) properties.
  • Explores the relationship between SCO and luminescence in molecular systems.
  • Addresses a correction to previously published findings.

Purpose:

  • To rectify errors and provide accurate data regarding the correlations between spin crossover and fluorescence.
  • To ensure the scientific record reflects the precise behavior of the dinuclear compound.
  • To refine the understanding of SCO-fluorescence coupling.

Summary:

  • Corrects specific details concerning the multiple correlations observed between spin crossover transitions and fluorescence emission in a dinuclear compound.
  • Provides updated information on the experimental data and analysis presented in the original publication.
  • Ensures the accurate representation of the interplay between spin state and photophysical properties.

Impact:

  • Enhances the reliability of scientific data in the field of spin crossover materials.
  • Facilitates a more accurate understanding of structure-property relationships in dinuclear SCO complexes.
  • Supports future research on developing advanced functional materials with tunable optical and magnetic properties.