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

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

964
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...
964
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
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
Phase Transitions02:31

Phase Transitions

19.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.3K
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: 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

You might also read

Related Articles

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

Sort by
Same author

Switchable Magnonic Crystals Based on Spin Crossover/CrSBr Heterostructures.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

NO photoswitches: a single photoinduced linkage isomer in diamagnetic {MNO}<sup>8</sup> complexes.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

A case of intraoperative intraductal ultrasonography-guided tumor-free resection margin in hilar cholangiocarcinoma (with videos).

Endoscopic ultrasound·2026
Same author

Optical signatures of hydration-controlled hysteretic spin-crossover in single crystals of an Fe(II) complex.

Dalton transactions (Cambridge, England : 2003)·2025
Same author

Indocyanine green fluorescence staining-guided laparoscopic posterosuperior segmentectomy: A multicenter retrospective cohort study.

Surgical endoscopy·2025
Same author

Ultrafast probing of isotope-induced explicit symmetry breaking in ethylene.

Communications chemistry·2025
Same journal

Anion-Engineered Organic Electrochemical Transistors With Multi-Timescale Synaptic Dynamics for Task-Adaptive Spiking Neural Networks.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Dimensional Effect on the Lattice Anharmonicity in Graphene and Graphite.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same journal

A Modular Core-Shell Nanoparticle Platform for Dual-Modal MRI-Luminescence With High Relaxivity.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Highly Selective Construction of D<sub>2</sub>-Symmetric Chiral Carbon Nanorings and the Diverse Assembly With Fullerenes.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same journal

A Synergistic Process Optimization and Data-Driven Modeling Strategy for Unraveling and Enhancing the Low-Light Response in Back-Contact Solar Cells.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Porous Hydrogel-Mediated One-Step Selection of Mannoprotein-Targeted Aptamers for Early Diagnosis of Invasive Saccharomyces cerevisiae Infections.

Small (Weinheim an der Bergstrasse, Germany)·2026
See all related articles

Related Experiment Video

Updated: Jul 28, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

9.8K

Laser-Driven Transient Phase Oscillations in Individual Spin Crossover Particles.

Yaowei Hu1, Matthieu Picher1, Marlène Palluel2

  • 1Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France.

Small (Weinheim an Der Bergstrasse, Germany)
|May 28, 2023
PubMed
Summary
This summary is machine-generated.

Spin crossover nanoparticles exhibit unique length oscillations after laser pulses, driven by rapid spin-state transitions. This resonant behavior in a first-order phase transformation offers insights into nanomaterial dynamics.

Keywords:
Monte Carlo calculationsphase transformationsspin crossover materialsultrafast transmission electron microscopy

More Related Videos

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.5K
Fabrication and Operation of a Nano-Optical Conveyor Belt
11:10

Fabrication and Operation of a Nano-Optical Conveyor Belt

Published on: August 26, 2015

11.6K

Related Experiment Videos

Last Updated: Jul 28, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

9.8K
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.5K
Fabrication and Operation of a Nano-Optical Conveyor Belt
11:10

Fabrication and Operation of a Nano-Optical Conveyor Belt

Published on: August 26, 2015

11.6K

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Spin crossover (SCO) nanoparticles are materials that can switch between low-spin and high-spin states.
  • Understanding the dynamics of these transitions at the nanoscale is crucial for potential applications.

Purpose of the Study:

  • To investigate the unusual expansion dynamics of individual SCO nanoparticles.
  • To elucidate the relationship between spin-state transitions and particle oscillations.

Main Methods:

  • Ultrafast transmission electron microscopy (UTEM) was used to observe nanoparticle expansion.
  • Nanosecond laser pulses were employed to trigger spin crossover.
  • Monte Carlo simulations were performed to model the observed phenomena.

Main Results:

  • SCO nanoparticles displayed significant length oscillations during and after expansion induced by laser pulses.
  • The oscillation period (50-100 ns) correlated with the spin-state transition time.
  • Simulations confirmed that elastic and thermal coupling drives resonant, repeated spin-state transitions.

Conclusions:

  • SCO nanoparticles exhibit resonant transitions between low-spin and high-spin states during a first-order phase transformation.
  • The observed length oscillations are a direct consequence of the interplay between mechanical and thermal properties during spin switching.
  • These findings highlight SCO nanoparticles as a unique system for studying dynamic phase transitions.