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

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.1K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

709
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
709
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.6K
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...
1.6K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
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...
12.3K
Valence Bond Theory02:42

Valence Bond Theory

9.1K
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...
9.1K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

2.4K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
2.4K

You might also read

Related Articles

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

Sort by
Same author

The non-covalent stereocontrol of disulfide bonds.

Chemical communications (Cambridge, England)·2026
Same author

A metal-DNA biohybrid as enantioselective artificial photoDNAzyme.

Nature communications·2026
Same author

Synthesis, Photophysical, and Chiroptical Properties of Optically Active BINOL-Boranil Enantiomers.

ACS omega·2026
Same author

Spin-Flip Upconversion Luminescence and Tunable Downshifting Near-Infrared Emissions via 4d-4f Interaction in Doped Halide Perovskite.

Angewandte Chemie (International ed. in English)·2026
Same author

Hydrogen bond driven supramolecular assemblies during hybrid mesoporous silica films structuration.

Nanoscale·2026
Same author

Synergistic Action of Crystallophore and Imaging-Crystallophore Enhances the Production and Imaging of Protein Crystals.

Angewandte Chemie (International ed. in English)·2026

Related Experiment Video

Updated: Aug 27, 2025

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
08:32

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

Published on: May 7, 2017

13.5K

Ni-Centered Coordination-Induced Spin-State Switching Triggered by Electrical Stimulation.

Shaymaa Al Shehimy1, Orsola Baydoun1, Sandrine Denis-Quanquin1

  • 1ENSL, CNRS, Laboratoire de Chimie UMR 5182, 46 allée d'Italie, 69342 Lyon, France.

Journal of the American Chemical Society
|September 26, 2022
PubMed
Summary

This study introduces a novel Ni(II)-porphyrin complex with a switchable spin state. Electrical stimulation reversibly controls the spin state from low to high, achieving 80% switching efficiency.

More Related Videos

Brain State-dependent Brain Stimulation with Real-time Electroencephalography-Triggered Transcranial Magnetic Stimulation
08:50

Brain State-dependent Brain Stimulation with Real-time Electroencephalography-Triggered Transcranial Magnetic Stimulation

Published on: August 20, 2019

14.5K
Direct-current Stimulation and Multi-electrode Array Recording of Seizure-like Activity in Mice Brain Slice Preparation
09:39

Direct-current Stimulation and Multi-electrode Array Recording of Seizure-like Activity in Mice Brain Slice Preparation

Published on: June 7, 2016

10.6K

Related Experiment Videos

Last Updated: Aug 27, 2025

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
08:32

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

Published on: May 7, 2017

13.5K
Brain State-dependent Brain Stimulation with Real-time Electroencephalography-Triggered Transcranial Magnetic Stimulation
08:50

Brain State-dependent Brain Stimulation with Real-time Electroencephalography-Triggered Transcranial Magnetic Stimulation

Published on: August 20, 2019

14.5K
Direct-current Stimulation and Multi-electrode Array Recording of Seizure-like Activity in Mice Brain Slice Preparation
09:39

Direct-current Stimulation and Multi-electrode Array Recording of Seizure-like Activity in Mice Brain Slice Preparation

Published on: June 7, 2016

10.6K

Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Nickel(II)-porphyrin complexes are known for their unique electronic and magnetic properties.
  • Controlling spin states in molecular systems is crucial for developing advanced electronic and magnetic devices.
  • Mechanical hinges offer a pathway to induce conformational changes and modulate molecular properties.

Purpose of the Study:

  • To synthesize and characterize a Ni(II)-porphyrin complex linked to an imidazole ligand via an electron-responsive mechanical hinge.
  • To investigate the electrical stimulation-triggered reversible folding motion of the mechanical hinge.
  • To explore the resulting spin-state switching of the Ni(II) center from low-spin to high-spin.

Main Methods:

  • Synthesis of the Ni(II)-porphyrin-imidazole conjugate.
  • Electrochemical methods to induce and control the folding motion.
  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • (Spectro)electrochemical measurements.
  • Magnetic property analysis.
  • Quantum chemical calculations.

Main Results:

  • Successful synthesis of the Ni(II)-porphyrin-imidazole system with a flexible mechanical hinge.
  • Demonstration of a large-amplitude, fully reversible folding motion triggered by electrical stimulation.
  • Observation of an 80% efficient spin-state switching of the Ni(II) center from low spin (S = 0) to high spin (S = 1) due to imidazole coordination.
  • Identification of π-dimerization of viologen cation radicals as the driving force for the folding motion.

Conclusions:

  • The developed molecular system exhibits electrically controlled, reversible spin-state switching.
  • This work demonstrates the potential of electron-responsive mechanical hinges for modulating magnetic properties in molecular materials.
  • The findings open avenues for designing novel molecular switches and stimuli-responsive magnetic materials.