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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.3K
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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Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

15.6K
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.
15.6K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.1K
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...
14.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.2K
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...
26.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.6K
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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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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Ag108(PEt3)24Cl6: A Hexagonal Prismatic Metalloid Cluster.

Mike Alexander Kordan1, Claudio Schrenk1, Andreas Schnepf1

  • 1Chemistry Department, University of Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 21, 2024
PubMed
Summary

Researchers synthesized the largest phosphine- and halide-stabilized silver cluster, Ag108(PEt3)24Cl6, revealing a unique hexagonal prism shape. This discovery offers insights into the formation of faceted silver nanoparticles.

Keywords:
Cluster compoundsHalidesP ligandsSensitive compoundsSilver

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Ligand choice critically impacts metalloid cluster structure and shape.
  • Phosphines are typically minor co-ligands in silver clusters, unlike thiolates and alkynyls.

Purpose of the Study:

  • To synthesize and structurally characterize the largest metalloid silver cluster stabilized solely by phosphine and halide ligands.
  • To investigate the structural and electronic properties of this novel silver cluster.

Main Methods:

  • Synthesis of the silver cluster Ag108(PEt3)24Cl6.
  • Single-crystal X-ray diffraction for structural characterization.

Main Results:

  • The largest structurally characterized metalloid silver cluster, Ag108(PEt3)24Cl6, was successfully synthesized.
  • The cluster exhibits a hexagonal prism shape, deviating from the typical spherical morphology.
  • A Ag64 subunit within the cluster suggests its role as a molecular seed for nanoparticle formation.

Conclusions:

  • Phosphines and halides can act as sole ligands to form large, structurally complex silver clusters.
  • The hexagonal prism structure provides new insights into cluster morphology.
  • This cluster serves as a precursor for creating faceted silver nanoparticles.