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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

16.7K
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...
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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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Metallic Solids02:37

Metallic Solids

20.4K
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....
20.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

11.3K
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...
11.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.8K
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...
19.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.8K
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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Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography
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Assessing Two-dimensional Crystallization Trials of Small Membrane Proteins for Structural Biology Studies by Electron Crystallography

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Two-dimensional inorganic molecular crystals.

Wei Han1, Pu Huang2, Liang Li1

  • 1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), 430074, Wuhan, China.

Nature Communications
|October 19, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to grow ultrathin inorganic molecular crystals. This technique controls crystal phase and growth, enabling potential applications in molecular electronics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Two-dimensional molecular crystals offer unique physical properties but are predominantly organic.
  • Synthesizing inorganic 2D molecular crystals faces challenges in controlling phase and growth orientation.
  • Developing inorganic 2D materials is crucial for advanced electronic applications.

Purpose of the Study:

  • To develop a method for synthesizing monolayer inorganic two-dimensional molecular crystals.
  • To control the crystal phase and growth plane during the synthesis of antimony trioxide (Sb2O3) molecular crystals.
  • To explore the potential of these materials in molecular electronics.

Main Methods:

  • Passivator-assisted vapor deposition technique was designed and employed.
  • In situ transmission electron microscopy (TEM) and Raman spectroscopy were utilized for characterization.
  • Controlled heating and electron-beam irradiation were used to induce phase transformation.

Main Results:

  • Successfully grew two-dimensional Sb2O3 inorganic molecular crystals as thin as a monolayer.
  • Passivator-assisted method prevented heterophase nucleation and directed growth along high-energy planes.
  • Demonstrated phase transformation from insulating α-Sb2O3 to semiconducting β-Sb2O3 under specific conditions.

Conclusions:

  • The passivator-assisted vapor deposition method enables controlled synthesis of 2D inorganic molecular crystals.
  • Phase transformation of Sb2O3 crystals can be achieved, opening possibilities for tunable electronic properties.
  • This approach holds promise for the fabrication of novel molecular electronic devices.