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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
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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Metallic Solids02:37

Metallic Solids

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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.2K
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...
28.2K
Network Covalent Solids02:18

Network Covalent Solids

14.9K
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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.1K
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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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

49.9K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes
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The layer silicate Cs2SnIVSi6O15.

Michael Ketter1, Matthias Weil1

  • 1Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.

Acta Crystallographica. Section E, Crystallographic Communications
|February 11, 2022
PubMed
Summary
This summary is machine-generated.

Single crystals of dicaesium tin(IV) hexa-silicate (Cs2SnSi6O15) were synthesized. Its crystal structure features silicate layers with Cs cations and tin octahedra, revealing a group-subgroup relationship with related compounds.

Keywords:
caesiumcrystal structuregroup-subgroup relationsilicatestin

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Silicate structures are diverse and fundamental in materials science.
  • Cesium silicates with tetravalent metals (MIV) exhibit interesting structural variations.
  • Understanding crystal structures aids in predicting material properties.

Purpose of the Study:

  • To synthesize and characterize the crystal structure of Cs2SnSi6O15.
  • To investigate the structural relationship between Cs2SnSi6O15 and other Cs2 MIVSi6O15 silicates.
  • To analyze the connectivity and ring formation within the silicate layers.

Main Methods:

  • Single crystal growth using a CsCl/NaCl flux method.
  • X-ray diffraction for crystal structure determination.
  • Comparative structural analysis with related compounds.

Main Results:

  • Single crystals of Cs2SnSi6O15 were successfully synthesized at 923 K.
  • The crystal structure consists of {Si6O15}6- layers with Cs+ cations and [SnO6] octahedra.
  • Silicate layers exhibit Q3 connectivity, forming five- and eight-membered rings, similar to zeravshanite.
  • A klassengleiche group-subgroup relationship (index 2) was identified between Cs2ZrSi6O15 and Cs2SnSi6O15.

Conclusions:

  • The crystal structure of Cs2SnSi6O15 was elucidated.
  • The structural framework is built upon silicate layers and interstitial cations/octahedra.
  • The findings contribute to the understanding of structure-property relationships in cesium silicates.