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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.1K
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...
18.1K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

25.9K
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...
25.9K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.0K
Valence Bond Theory02:42

Valence Bond Theory

8.4K
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...
8.4K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.4K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.4K

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Deciphering the structural code for the face-centered-cubic ligand protected intermetallic AuAg nanoclusters.

Endong Wang1, Yi Gao2

  • 1School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China.

The Journal of Chemical Physics
|March 27, 2025
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Summary
This summary is machine-generated.

This study identifies the tetrahedral Au3Ag(2e) as a core building block in gold-silver alloy nanoclusters. These findings clarify the structure-property relationships for advanced materials in optics, electronics, and catalysis.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Incorporating silver (Ag) atoms into gold (Au) nanoclusters tunes properties for optics, electronics, and catalysis.
  • Structural complexity of doped nanoclusters hinders understanding structure-activity relationships.

Purpose of the Study:

  • To identify fundamental building blocks of face-centered-cubic (FCC) ligand-protected gold-silver (LP-AuAg) alloy nanoclusters.
  • To establish structure-activity relationships in LP-AuAg alloy nanoclusters.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Energy evaluation, structural analysis, valence electron counting, and localized molecular orbital topology.
  • Characterization of the tetrahedral Au3Ag(2e) building block.

Main Results:

  • Identified the tetrahedral Au3Ag with two valence electrons [Au3Ag(2e)] as a key building block.
  • Demonstrated that FCC LP-AuAg clusters are formed by packing Au3Ag(2e), Au4(2e), and Au3(2e) blocks.
  • Predicted 40 FCC LP-AuAg nanoclusters with 141 low-energy isomers.

Conclusions:

  • Subset blocks play a critical role in stabilizing entire nanoclusters.
  • Provides insights into the structural characteristics of FCC LP-AuAg alloy nanoclusters.
  • Facilitates the design of novel alloy nanoclusters with tailored properties.