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

Colors and Magnetism03:02

Colors and Magnetism

11.7K
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...
11.7K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

985
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,...
985
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

2.3K
2.3K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.0K
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...
1.0K
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
Valence Bond Theory02:42

Valence Bond Theory

8.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.6K

You might also read

Related Articles

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

Sort by
Same author

Cation-templated synthesis of a Fe<sub>4</sub>Co<sub>20</sub> cyanometallate cluster.

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

A Molecular Playground for Spin-State Ice and Coupled Electron-Spin Dynamics.

Journal of the American Chemical Society·2026
Same author

Vitrification-Enabled Stabilization of Persistent Radicals in Chiral Hybrid Zinc Chloride Glass for Enhanced Luminescence Properties.

Journal of the American Chemical Society·2026
Same author

Tetrazine-Radical-Bridged Lanthanide Complexes: From Di- to Trinuclear Single-Molecule Magnets.

Inorganic chemistry·2026
Same author

A benzothiadiazole-based polar fluorescent probe for targeting lipid droplets in living cells.

Analytical methods : advancing methods and applications·2025
Same author

Impact of CT turnaround time on diagnostic and clinical outcomes in acute abdominal pain: A retrospective cohort study.

The American journal of emergency medicine·2025

Related Experiment Video

Updated: Jul 8, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.5K

Exploring a prototype for cooperative structural phase transition in cobalt(II) spin crossover compounds.

Yi-Fei Deng1, Yi-Nuo Wang1, Xin-Hua Zhao1

  • 1Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China. zhangyz@sustech.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|December 11, 2023
PubMed
Summary

Researchers developed new cobalt(II) compounds exhibiting both spin crossover (SCO) and structural phase transitions (SPT). One material showed unique magnetic behavior with wide hysteresis, demonstrating the synergy between SCO and SPT for advanced magnetic materials.

More Related Videos

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

8.8K
Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

7.1K

Related Experiment Videos

Last Updated: Jul 8, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.5K
Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

8.8K
Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
06:31

Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

7.1K

Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Magnetism

Background:

  • Developing materials with coupled spin crossover (SCO) and structural phase transitions (SPT) is a significant challenge.
  • SCO materials switch between high-spin and low-spin states, while SPT involves changes in crystal structure, offering potential for advanced functionalities.
  • Cobalt(II)-based complexes are promising candidates for SCO due to their electronic configurations.

Purpose of the Study:

  • To synthesize and characterize novel cobalt(II)-based SCO compounds that integrate SCO with SPT.
  • To investigate the magnetic properties and the interplay between SCO and SPT in these new materials.
  • To explore the potential for achieving synergistic SCO-SPT behavior for magnetically switchable materials.

Main Methods:

  • Synthesis of four structurally related cobalt(II) complexes: two 1D chains and two dinuclear segments.
  • Characterization using X-ray crystallography and magnetic susceptibility measurements.
  • Investigation of SCO and SPT properties, including hysteresis and rate dependence, in both solvated and desolvated phases.

Main Results:

  • All synthesized complexes exhibited incomplete and gradual SCO properties.
  • The desolvated phase of one 1D chain compound displayed a distinct non-spin magnetic transition with wide room-temperature hysteresis (>40 K).
  • This transition was reversible and rate-dependent, indicating a synergistic interplay between SCO and SPT driven by slow kinetics.

Conclusions:

  • The study successfully prepared cobalt(II) compounds demonstrating coupled SCO and SPT phenomena.
  • The observed magnetic transition highlights the potential for achieving switchable materials through the synergy of SCO and SPT.
  • Combining rigid frameworks with flexible substituents is a promising strategy for designing materials with tunable magnetic properties.