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: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...

You might also read

Related Articles

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

Sort by
Same author

Correction: Dodecanuclear [NiII8Ln<sub>4</sub>] clusters and rings of corner-sharing {NiII2Ln<sub>2</sub>} cubanes (Ln = Dy, Gd, Y); magnetic and magnetothermal properties.

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

A nitrito-κN ligand in pentacyanidocobaltate(III) linkers as a polarity inducer in heterometallic frameworks incorporating lanthanide(III) molecular nanomagnets.

Chemical communications (Cambridge, England)·2026
Same author

Measurement of Line Width and Anisotropy in <i>C</i><sub>3</sub>/<i>C</i><sub>4</sub>-Symmetric Gd(III) Complexes.

Inorganic chemistry·2026
Same author

Reactions of a Uranium(III) Complex with <i>N</i>-Heterocycles to Form Diuranium(IV) Ketimides.

Inorganic chemistry·2026
Same author

Compression of Ribavirin to 35 GPa.

Crystal growth & design·2026
Same author

Phase relationships in homoleptic complexes of XeF<sub>2</sub>.

IUCrJ·2026
Same journal

On-Cell Detection of Polysaccharide One-Bond <sup>1</sup>J<sub>CH</sub> Couplings by Proton-Detected Solid-State NMR.

Journal of the American Chemical Society·2026
Same journal

Correction to "Unraveling the Effects of Fe Incorporation on High-Performance Water-Splitting Photoanodes".

Journal of the American Chemical Society·2026
Same journal

Proximity-Driven Protein Ligation Beyond the Concentration Limit.

Journal of the American Chemical Society·2026
Same journal

GraPhAI: Neural Networks for Solving Centrosymmetric Crystal Structures.

Journal of the American Chemical Society·2026
Same journal

Probing Stage Transition Kinetics in Li-Graphite Intercalation Compounds by Time-Resolved In Situ Solid-State NMR via <sup>13</sup>C Labeling.

Journal of the American Chemical Society·2026
Same journal

Dynamic Covalent Programming at DNA Base-Pairing Interfaces.

Journal of the American Chemical Society·2026
See all related articles

Related Experiment Video

Updated: May 23, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Pressure Tuning of the Low-Frequency Raman Response in Spin-Crossover Networks.

Guanping Li1,2, Olaf Stefanczyk2, Joseph M Flitcroft1

  • 1Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K.

Journal of the American Chemical Society
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Novel molecular materials exhibit spin-crossover (SCO) properties, enabling tunable terahertz (THz) responses. Pressure-induced changes in spin states and low-frequency phonon modes offer new pathways for designing advanced photonic devices.

More Related Videos

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
15:04

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

Published on: May 18, 2011

Related Experiment Videos

Last Updated: May 23, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
15:04

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

Published on: May 18, 2011

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Stimuli-responsive molecular materials are key for next-generation photonic technologies.
  • Low-frequency (LF) terahertz (THz) responses are crucial for molecular switches and sensors.

Purpose of the Study:

  • To synthesize and characterize novel spin-crossover (SCO) materials.
  • To investigate pressure-induced effects on SCO and THz responses.
  • To establish pressure tuning as a method for modulating THz light.

Main Methods:

  • Synthesis of two novel SCO compounds by controlling precursor ratios.
  • Pressure-dependent crystallographic, magnetic, and Raman spectroscopic studies.
  • First-principles modeling of phonon modes and THz absorption.

Main Results:

  • Pressure-induced spin-crossover (high-spin to low-spin Fe(II)) at room temperature and ~1 GPa.
  • Significant blue shifts in Raman-active modes under compression, with high pressure sensitivity.
  • Observation of an unusual red shift in a low-energy mode during pressure-induced SCO.
  • Reliable reproduction of THz absorption and Raman spectra through first-principles modeling.

Conclusions:

  • Pressure tuning of LF phonon modes and spin states in SCO materials is a viable strategy.
  • This approach provides new avenues for designing tunable THz absorbers.
  • The findings advance the development of molecular switches and sensors for advanced photonics.