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Valence Bond Theory

Valence Bond Theory

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...

Colors and Magnetism

Colors and Magnetism

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...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

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...

Metal-Ligand Bonds

Metal-Ligand Bonds

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...

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

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...

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Related Experiment Video

Updated: Aug 8, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Published on: September 19, 2020

Coupling Dielectric Functionality with Magnetic Properties in Coordination Metal Complexes.

Yoshihiro Sekine^1,2, Rikuto Nakamura¹, Ryohei Akiyoshi³

¹Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.

|March 2, 2023

Summary

Coordination metal complexes offer tunable ferroelectric and magnetic properties, crucial for novel magnetoelectric devices. This review highlights recent advances in these materials, focusing on coupled magnetic and dielectric functionalities.

Keywords:

coordination complexes dielectric properties electronic polarization ferroelectric materials magnetic properties

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Area of Science:

Materials Science
Solid-State Chemistry
Magnetism

Background:

Research on molecular ferroelectric materials is extensive, yet studies on coordination metal complexes are limited.
Coordination metal complexes offer tunable structures and potential synergy between ferroelectric and magnetic properties.
Few coordination metal complexes demonstrate strong coupling between magnetic and dielectric properties, unlike inorganic compounds.

Purpose of the Study:

To review recent advancements in coordination metal complexes exhibiting coupled magnetic and ferroelectric/dielectric properties.
To explore the potential of these materials in developing novel magnetoelectric devices.
To highlight specific classes of compounds, including single-molecule magnets and electron delocalization systems.

Main Methods:

Literature review of recent research on coordination metal complexes.
Analysis of studies focusing on the interplay between magnetic and dielectric properties.
Categorization of compounds based on their functionalities (e.g., single-molecule magnets, stimuli-responsive).

Main Results:

Coordination metal complexes can exhibit coupled ferroelectric and magnetic behaviors.
Strong coupling leads to variations in dielectric permittivity under magnetic fields.
These materials show promise for applications in magnetoelectric devices.

Conclusions:

Coordination metal complexes represent a promising class of materials for advanced electronic and magnetic applications.
Further research into these materials could unlock new possibilities for multifunctional devices.
The tunability of these complexes allows for tailored design of materials with specific properties.