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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.3K
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...
26.3K
Metallic Solids02:37

Metallic Solids

18.4K
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....
18.4K
Properties of Transition Metals02:58

Properties of Transition Metals

25.4K
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.
25.4K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

358
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...
358
Structural Isomerism02:34

Structural Isomerism

19.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.2K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Updated: Jun 21, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Structure evolution and specific effects for the catalysis of atomically ordered intermetallic compounds.

Lei Wang1, Zequan Ma1, Jia Xue1

  • 1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China. leiwang88@yzu.edu.cn.

Nanoscale
|July 9, 2024
PubMed
Summary
This summary is machine-generated.

Atomically ordered intermetallic compounds (IMCs) offer superior catalytic performance due to their defined structures. This review highlights their applications and the mechanisms behind their enhanced activity and stability.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Science

Background:

  • Atomically ordered intermetallic compounds (IMCs) are advanced materials for catalysis.
  • IMCs exhibit enhanced geometric and electronic effects compared to random alloys.
  • Their well-defined structures serve as ideal models for mechanistic studies.

Purpose of the Study:

  • To review the elemental composition, electron transfer, and structural evolution of IMCs.
  • To provide evidence of metal atom migration and rearrangement using electron microscopy.
  • To discuss IMC applications in nanotube growth, hydrogenation/dehydrogenation, and electrocatalysis.

Main Methods:

  • Focus on elemental composition, electron transfer, and structure/phase evolution under thermal treatment.
  • Utilize electron microscopy to observe metal atom migration and rearrangement.
  • Analyze catalytic performance based on electronic, geometric, strain, and bifunctional effects.

Main Results:

  • IMCs demonstrate pronounced geometric and electronic effects, leading to high catalytic activity, selectivity, and longevity.
  • Electron microscopy provides direct evidence of atomic rearrangement in IMCs.
  • IMCs show outstanding applications in single-walled nanotube synthesis, hydrogenation/dehydrogenation, and electrocatalysis.

Conclusions:

  • IMCs are highly effective catalysts due to their ordered atomic structures.
  • Understanding atomic migration and electronic effects is crucial for optimizing IMC catalysts.
  • Future research should address limitations of in situ techniques for IMC studies.