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

14.4K
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...
14.4K
Valence Bond Theory02:42

Valence Bond Theory

11.5K
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...
11.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.9K
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...
1.9K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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...
1.6K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.6K
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,...
1.6K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.6K
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...
3.6K

You might also read

Related Articles

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

Sort by
Same author

Development and validation of an interpretable ultrasound radiomics model for benign and malignant classification of breast lesions: a multicenter large-sample study.

Insights into imaging·2026
Same author

The effect of laser-assisted hatching on clinical outcomes of frozen-thawed embryo transfer at different embryo ages.

European journal of obstetrics & gynecology and reproductive biology: X·2026
Same author

Anthraquinone-Based Donor-Acceptor Covalent Organic Frameworks with Thiazole Linkages to Enhance Direct Hydrogen Atom Transfer and Charge Separation in Photocatalytic Oxidation of C(sp<sup>3</sup>)─H Bonds.

Angewandte Chemie (International ed. in English)·2025
Same author

Aluminum exposure disturbs epigenetic modification and organelle function during early embryo development.

Chemico-biological interactions·2025
Same author

[Effect of electroacupuncture on cGAS/STING/NLRP3 pathway of the cerebral cortex in rats with cerebral ischemia reperfusion injury].

Zhen ci yan jiu = Acupuncture research·2025
Same author

Clinical <i>Mycobacterium tuberculosis</i> isolates exhibit a molecular clock rate below 1 SNP per genome per year.

Frontiers in microbiology·2025
Same journal

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

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

High-field multinuclear MAS NMR and synchrotron XANES reveal the influence of strontium salt chemistry on geopolymer nanostructure.

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

Carbonyl insertion into metal-boron based clusters: pathway to a rhodathiacarborane.

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

Simulation of displacement damage in CsPbBr<sub>3</sub> induced by neutron irradiation based on the Monte Carlo method.

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

Photocatalysis-tribocatalysis synergy in oxygen vacancy-rich Zn<sub>2</sub>SnO<sub>4</sub>: mechanism and enhanced all-day performance.

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

Two-dimensional Co/Ni coordination polymers: structure-activity relationship and bifunctional performance for electrocatalysis and energy storage.

Dalton transactions (Cambridge, England : 2003)·2026
See all related articles

Related Experiment Video

Updated: Mar 11, 2026

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
06:54

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology

Published on: July 5, 2022

2.8K

Magnetic fluorescent bifunctional spin-crossover complexes.

Jun-Li Wang1, Qiang Liu1, Xiao-Jin Lv1

  • 1State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|November 23, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed novel iron(II) complexes exhibiting both magnetic spin crossover and fluorescence. These bifunctional materials show potential for advanced applications, with co-ligand choice influencing the spin transition temperature.

More Related Videos

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
10:11

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Published on: July 26, 2024

1.7K
A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
12:51

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

10.5K

Related Experiment Videos

Last Updated: Mar 11, 2026

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
06:54

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology

Published on: July 5, 2022

2.8K
Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
10:11

Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level

Published on: July 26, 2024

1.7K
A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
12:51

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

10.5K

Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Supramolecular Chemistry

Background:

  • Bifunctional materials combining magnetic and fluorescent properties are of significant interest.
  • Spin crossover (SCO) materials offer tunable magnetic properties.
  • Fluorescent ligands can impart optical functionalities to metal complexes.

Purpose of the Study:

  • To synthesize and characterize novel mononuclear Fe(II) complexes with bifunctional magnetic and fluorescent properties.
  • To investigate the spin crossover behavior and its interplay with fluorescence in the designed complexes.
  • To explore the effect of co-ligands on the spin transition temperature and photomagnetic properties.

Main Methods:

  • Synthesis of two mononuclear Fe(II) complexes: [Fe(L)2(NCS)2] (1) and [Fe(L)2(NCSe)2] (2), where L is a fluorescent ligand.
  • Single-crystal X-ray diffraction studies.
  • Variable-temperature magnetic susceptibility measurements.
  • Temperature-dependent Raman and infrared spectroscopy.
  • Variable-temperature fluorescence emission spectroscopy.

Main Results:

  • Both complexes exhibit spin crossover behavior, confirmed by magnetic and spectroscopic measurements.
  • Thermally and light-induced spin crossover phenomena were observed.
  • The nature of the co-ligand (NCS- vs. NCSe-) significantly impacts the SCO transition temperature (~60 K difference).
  • Infrared spectra post-irradiation indicate photomagnetic effects at 10 K.
  • Coexistence of spin crossover and fluorescence was demonstrated through temperature-dependent fluorescence spectra.

Conclusions:

  • Novel bifunctional Fe(II) complexes integrating spin crossover and fluorescence have been successfully synthesized.
  • The study highlights the tunability of spin crossover properties through co-ligand modification.
  • These materials demonstrate the potential for developing advanced responsive systems with coupled magnetic and optical responses.