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Related Concept Videos

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
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.4K
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...
27.4K
Structural Isomerism02:34

Structural Isomerism

19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.6K

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Ferroelectric coordination metal complexes based on structural and electron dynamics.

Ryohei Akiyoshi1, Shinya Hayami2

  • 1Department of Chemistry, School of Science, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.

Chemical Communications (Cambridge, England)
|July 15, 2022
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Coordination metal complexes offer new avenues for ferroelectric materials, utilizing both structural and electron dynamics for reversible polarization. This research explores their potential for advanced applications like multiferroics and spintronics.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Coordination Chemistry

Background:

  • Ferroelectric materials with electrically invertible polarization are crucial for diverse applications.
  • Existing research primarily focuses on organic/inorganic ferroelectrics, with limited exploration of coordination metal complexes.
  • Structural dynamics (atomic displacement, ion/molecule reorientation) are key to reversible polarization in known ferroelectrics.

Purpose of the Study:

  • To review recent advancements in coordination metal complex-based ferroelectrics.
  • To highlight the dual origins of reversible polarization: structural and electron dynamics.
  • To discuss the synergistic effects, including magnetoelectric coupling, arising from these dynamics.

Main Methods:

  • Review of existing literature on coordination metal complex-based ferroelectrics.
  • Analysis of mechanisms driving reversible polarization, including proton transfer, molecular motion, liquid crystalline behavior, electron transfer, and spin crossover.
  • Examination of magnetoelectric coupling phenomena.

Main Results:

  • Coordination metal complexes exhibit ferroelectricity driven by both structural dynamics and electron dynamics at the metal center.
  • Electron dynamics, such as electron transfer and spin crossover, contribute uniquely to ferroelectric properties.
  • Synergistic effects, including magnetoelectric coupling, are observed due to the interplay of structural and electron dynamics.

Conclusions:

  • Coordination metal complex-based ferroelectrics present a promising, largely unexplored area of materials science.
  • The combination of structural and electron dynamics offers novel pathways for designing advanced functional materials.
  • This review provides insights for developing next-generation multiferroics and spintronics devices.