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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
26.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Properties of Transition Metals02:58

Properties of Transition Metals

25.0K
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.
25.0K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
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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Metallic Solids02:37

Metallic Solids

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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....
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Band Theory02:35

Band Theory

14.9K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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Updated: Jun 4, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Two-Dimensional Transition Metal Dichalcogenides: A Theory and Simulation Perspective.

Sunny Gupta1,2, Jun-Jie Zhang1,3, Jincheng Lei1,4

  • 1Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States.

Chemical Reviews
|January 2, 2025
PubMed
Summary
This summary is machine-generated.

Theory and simulations accelerate advancements in two-dimensional transition metal dichalcogenides (2D TMDs). These computational methods are crucial for understanding properties, predicting quantum phases, and realizing commercial applications of 2D TMD materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional transition metal dichalcogenides (2D TMDs) are key functional materials for electronics, catalysis, and quantum technologies.
  • Theory and simulations are vital for understanding 2D TMD properties and designing devices.

Purpose of the Study:

  • To review the significant contributions of theory and simulations to recent progress in 2D TMD research.
  • To highlight achievements and identify challenges in the field.

Main Methods:

  • Ab initio theory
  • Deep learning
  • Molecular dynamics
  • High-throughput computations
  • Multiscale methods

Main Results:

  • Understanding of twisted moiré-based 2D TMD properties.
  • Prediction of quantum phases in TMD monolayers and heterostructures.
  • Elucidation of TMD synthesis processes and electron transport in devices.

Conclusions:

  • Theory and simulations have driven major advancements in 2D TMD research.
  • Further theoretical and simulation efforts are needed to realize the commercial potential of 2D TMD devices.