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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”.

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

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....

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.

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...

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...

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Related Experiment Video

Updated: Feb 8, 2026

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

Published on: March 13, 2017

Interlayers Self-Generated by Additive-Metal Interactions in Organic Electronic Devices.

Jane Vinokur¹, Igal Deckman², Tanmoy Sarkar¹

¹Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa, 32000, Israel.

Advanced Materials (Deerfield Beach, Fla.)

|July 11, 2018

Summary

A new method creates self-generated interlayers in organic electronics by blending additives into the active layer. This improves device performance and is compatible with high-speed manufacturing.

Keywords:

interlayer additives morphology organic electronics self-generated interlayers

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Area of Science:

Organic electronics
Materials science
Device fabrication

Background:

Organic electronic devices rely on layered structures between electrodes.
Achieving precise interlayer control during solution processing is difficult.
Current methods are often incompatible with high-speed manufacturing.

Purpose of the Study:

To present a novel methodology for self-generating interlayers in organic electronic devices.
To demonstrate the compatibility of this method with scalable manufacturing processes.
To highlight the performance enhancements achieved through self-generated interlayers.

Main Methods:

A novel additive migration technique for in-situ interlayer formation.
Blending interlayer material as an additive within the active layer.
Utilizing additive-metal interactions to drive interlayer formation during metal deposition.

Main Results:

Self-generated interlayers form at the organic/metal interface.
Interfacial dipoles are created, reducing charge transfer barriers.
Significant performance improvements observed across various organic electronic devices.
Method is compatible with printing and reel-to-reel processing.

Conclusions:

The self-generation of interlayers offers a versatile and effective approach for enhancing organic electronic devices.
This methodology overcomes limitations of traditional solution processing for multilayer fabrication.
The approach is scalable and suitable for continuous, high-speed manufacturing applications.