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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 eye.

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...

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. Many...

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

Metal-Semiconductor Junctions

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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...

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Related Experiment Video

Updated: Jun 16, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Enhanced quantum confinement due to nonuniform composition in alloy quantum dots.

M Z Hossain¹, N V Medhekar, V B Shenoy

¹Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA.

|February 4, 2010

Summary

Strain and composition variations impact alloy quantum systems. Nonuniform alloy distribution enhances confinement, making large quantum dots behave like smaller ones, aiding performance prediction.

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Compact Quantum Dots for Single-molecule Imaging

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Area of Science:

Materials Science
Condensed Matter Physics
Quantum Mechanics

Background:

Self-assembled alloy quantum systems exhibit electronic and optical properties sensitive to strain and composition.
Understanding these variations is crucial for designing advanced nanoscale devices.

Purpose of the Study:

To develop an efficient and accurate method for studying the effects of strain and composition on quantum confinement in alloy quantum dots.
To investigate how nonuniform alloy distributions influence quantum confinement behavior.

Main Methods:

Utilized a combination of finite element and first-principles computational methods.
Developed a novel technique to quantitatively analyze strain and composition effects.

Main Results:

Demonstrated that nonuniform alloy component distribution can create an enhanced confinement potential.
Showed that large quantum dots with nonuniform composition can exhibit electronic properties similar to smaller, uniform dots.

Conclusions:

The developed approach provides a general framework for predicting the impact of nanoscale variations on alloy quantum systems.
This work offers insights into optimizing the performance of various small-scale alloy systems by controlling strain and composition.