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Bonding in Metals

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.

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...

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

Theory of Metallic Conduction

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...

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Related Experiment Video

Updated: Feb 10, 2026

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

Published on: January 26, 2016

Manipulating Metal-to-Metal Charge Transfer for Materials with Switchable Functionality.

Yin-Shan Meng¹, Osamu Sato², Tao Liu¹

¹State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Rd., Dalian, 116024, P.R. China.

Angewandte Chemie (International Ed. in English)

|May 9, 2018

Summary

Metal-to-metal charge transfer (MMCT) enables electron transfer between metal ions, altering material properties. This phenomenon is key for developing switchable multifunctional devices with tunable magnetic, electric, and optical behaviors.

Keywords:

electric magnetic metal-to-metal charge transfer photochromism thermal expansion

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Area of Science:

Materials Science
Chemistry
Physics

Background:

Metal-to-metal charge transfer (MMCT) involves electron transfer between metal ions, creating valence isomers with distinct electronic configurations.
MMCT significantly impacts spin states, inter-metal coupling, charge distribution symmetry, and consequently, magnetic and electric properties.
This process also induces changes in bond length, absorption spectra, thermal expansion, and photochromic behavior.

Purpose of the Study:

To review recent advancements in using MMCT units as actuators.
To highlight the tuning of magnetic, electric, thermal expansion, and photochromic properties in cyanide-bridged systems via MMCT.
To discuss current challenges and future directions in the field of MMCT-driven materials.

Main Methods:

Review of literature on cyanide-bridged systems exhibiting MMCT.
Analysis of how MMCT influences various material properties (magnetic, electric, thermal, optical).
Focus on the role of MMCT in creating switchable multifunctional materials.

Main Results:

MMCT effectively modulates magnetic, electric, thermal expansion, and photochromic properties.
Cyanide-bridged systems demonstrate significant property changes upon MMCT induction.
Materials exhibiting MMCT are promising for switchable multifunctional devices.

Conclusions:

MMCT is a powerful mechanism for tuning material properties.
Further research is needed to overcome challenges and fully exploit MMCT for advanced device applications.
The field shows great potential for developing novel materials with synergistic responses.