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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
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CFT focuses on...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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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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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Isomerism in Complexes
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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Crystal structure of (

Bogdan Doboszewski1, Alexander Y Nazarenko2, Victor N Nemykin3

  • 1Departamento de Química, Universidade Federal Rural de Pernambuco, 52171-900 Recife, PE, Brazil.

Acta Crystallographica. Section E, Crystallographic Communications
|September 19, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals a unique crystal structure of a siloxane-diol compound, featuring eight chiral molecules forming hydrogen-bonded assemblies. These structures exhibit a brick-wall-like packing and maintain stability over a wide temperature range.

Keywords:
(S)-1-O-t-butyl­diphenyl­silylglycerolchiralcrystal structuredisorderhigh Z′ structure

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Area of Science:

  • Crystallography
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Understanding the self-assembly of chiral molecules is crucial for developing advanced materials.
  • Siloxane-based compounds offer unique properties due to the silicon-oxygen backbone.

Purpose of the Study:

  • To elucidate the crystal structure and intermolecular interactions of 3-[(tert-butyl-diphenyl-sil-yl)-oxy]propane-1,2-diol.
  • To investigate the influence of temperature on the crystal structure and molecular disorder.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Variable-temperature crystallographic studies.

Main Results:

  • The asymmetric unit contains eight chiral molecules (Z' = 8).
  • Molecules form infinite hydrogen-bonded assemblies along the [100] axis with hydrophobic exteriors.
  • Assemblies exhibit a 'header bond' masonry brick wall packing.

Conclusions:

  • The compound displays a complex, ordered supramolecular architecture driven by hydrogen bonding.
  • The crystal structure remains stable across a significant temperature range (120-220 K), indicating thermal robustness.