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Related Concept Videos

Metallic Solids02:37

Metallic Solids

16.3K
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...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.5K
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...
13.5K
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

264
Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
264
Network Covalent Solids02:18

Network Covalent Solids

12.8K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
12.8K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Spatial Separation of Molecular Conformers and Clusters
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Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

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Assembling hierarchical cluster solids with atomic precision.

Ari Turkiewicz1, Daniel W Paley, Tiglet Besara

  • 1Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society
|October 21, 2014
PubMed
Summary
This summary is machine-generated.

Researchers created hierarchical solids using cobalt chalcogenide and iron oxide molecular clusters. These binary ionic compounds form unique superstructures with atomic and superatomic resolution, offering insights into advanced materials.

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Spatial Separation of Molecular Conformers and Clusters
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Hierarchical solids offer unique properties through controlled assembly.
  • Molecular clusters provide tunable building blocks for advanced materials.
  • Cobalt chalcogenides and iron oxides are promising for electronic and magnetic applications.

Purpose of the Study:

  • To construct hierarchical solids from binary assembly of cobalt chalcogenide and iron oxide molecular clusters.
  • To investigate the structural characteristics and formation mechanisms of these novel crystalline materials.
  • To explore the potential of using molecular clusters as superatomic building blocks.

Main Methods:

  • Synthesis of six different molecular clusters: octahedral Co6E8 (E = Se or Te) and expanded cubane Fe8O4 units.
  • Crystallization of binary ionic compounds driven by charge transfer between electron-donating and electron-accepting clusters.
  • Structural analysis using single-crystal X-ray diffraction for atomic and superatomic resolution.

Main Results:

  • Successful formation of hierarchical solids through binary assembly of molecular clusters.
  • Identification of two distinct superstructures: a CsCl-type relative and a double-hexagonal close-packed arrangement.
  • Demonstration of varied cluster compositions and orientations within the superstructures.
  • Atomic and superatomic resolution achieved, revealing detailed structural insights.

Conclusions:

  • Hierarchical solids can be controllably assembled from molecular clusters.
  • The charge transfer mechanism facilitates the formation of binary ionic crystalline compounds.
  • The reported superstructures provide new paradigms for crystal engineering with molecular building blocks.