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

14.5K
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...
14.5K
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
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.5K
Ferromagnetism01:31

Ferromagnetism

3.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.4K
Formation of Complex Ions03:45

Formation of Complex Ions

26.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
26.6K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

931
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
931

You might also read

Related Articles

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

Sort by
Same author

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

Journal of the American Chemical Society·2026
Same author

A dysprosium alkylidene single molecule magnet.

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

Antenna Effect in Halogen-Containing ZnSm Coordination Compounds: Utilizing Colorimetry for a Room-Temperature Tunable Ratiometric Molecular Thermometer.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

A molecular dual-center emitter for ratiometric optical thermometry.

Chemical science·2026
Same author

Analysis the incidence and related risk factors of depression in patients with esophageal cancer combined with bone metastasis.

World journal of psychiatry·2026
Same author

Artificial Mn<sub>4</sub>SrO<sub>4</sub>-Cluster Mimicking the Structural Changes of the Photosynthetic Oxygen-Evolving Center.

Journal of the American Chemical Society·2025

Related Experiment Video

Updated: Mar 17, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K

Two Magnetic Switching Complexes Based on the Fe(II) Ion.

Qian Yang1,2, Chen Gao2, Ye-Xin Wang2

  • 1College of Science, Tianjin University of Science and Technology , Tianjin 300457, China.

Inorganic Chemistry
|August 2, 2016
PubMed
Summary
This summary is machine-generated.

Two new iron(II) complexes with distinct spin-crossover (SCO) behaviors were synthesized. The positional isomerism of thiophene substituents on the ligands influences SCO properties, leading to gradual or abrupt transitions.

More Related Videos

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.7K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.3K

Related Experiment Videos

Last Updated: Mar 17, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K
Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.7K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.3K

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Spin Crossover Phenomena

Background:

  • Spin crossover (SCO) in iron(II) complexes is a phenomenon with potential applications in molecular switches and sensors.
  • The electronic and structural properties of ligands play a crucial role in tuning SCO behavior.
  • Imidazo[4,5-f][1,10]phenanthroline derivatives offer versatile platforms for designing SCO materials.

Purpose of the Study:

  • To synthesize and characterize two neutral mononuclear iron(II) complexes with varying SCO properties.
  • To investigate the effect of substituent position on the imidazo[4,5-f][1,10]phenanthroline ligand on SCO behavior.
  • To explore the potential of these complexes for applications requiring tunable spin transitions.

Main Methods:

  • Solvothermal synthesis of iron(II) complexes.
  • Characterization of the synthesized complexes, including structural and spin crossover property analysis.
  • Variable temperature magnetic susceptibility measurements to determine SCO transition temperatures and hysteresis.

Main Results:

  • Two neutral mononuclear iron(II) complexes, Fe(L1)2(SCN)2 (1) and Fe(L2)2(SCN)2 (2), were successfully synthesized.
  • Complex 1, featuring a thiophen-3-yl substituent, exhibits gradual spin crossover around room temperature (T1/2 = 280 K).
  • Complex 2, with a thiophen-2-yl substituent, displays abrupt spin crossover with a 10 K hysteresis (T1/2↓ = 210 K, T1/2↑ = 220 K).

Conclusions:

  • The positional isomerism of the thiophene substituent on the 1,10-phenanthroline derivative significantly impacts the spin crossover properties of the iron(II) complexes.
  • Complex 1 demonstrates a gradual SCO transition, while Complex 2 shows a sharp SCO transition with hysteresis, highlighting the fine-tuning capability through ligand design.
  • These findings contribute to the understanding of structure-property relationships in SCO materials and offer insights for designing new functional molecular materials.