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Related Concept Videos

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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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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Structure of 1,5,9-trinitrobishomopentaprismane.

H L Ammon1, L A Paquette

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park 20742.

Acta Crystallographica. Section C, Crystal Structure Communications
|October 15, 1991
PubMed
Summary
This summary is machine-generated.

The crystal structure of 2,3,8-Trinitrohexacyclo[5.4.1.0(2,6).0(3,10).-0(4,8).0(9,12)]dodecane (IV) was determined. Despite higher molecular density, its crystal density is only slightly greater than compound (III) due to less efficient packing.

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Area of Science:

  • Crystallography
  • Materials Science
  • Organic Chemistry

Background:

  • High-energy materials research focuses on density and stability.
  • Understanding crystal packing is crucial for predicting material properties.

Purpose of the Study:

  • To determine the crystal structure of 2,3,8-Trinitrohexacyclo[5.4.1.0(2,6).0(3,10).-0(4,8).0(9,12)]dodecane (IV).
  • To compare crystal packing efficiency and density with a related compound, 1,5-dinitrobishomopentaprismane (III).

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Calculation of crystal packing coefficients.
  • Comparison of molecular and crystal densities.

Main Results:

  • The crystal structure of compound (IV) was solved, revealing an orthorhombic system (Pna2(1)) with specific lattice parameters.
  • Compound (IV) has a higher molecular density than compound (III).
  • Despite higher molecular density, compound (IV)'s crystal density is only 2.3% greater than (III) due to less efficient crystal packing.

Conclusions:

  • The molecular shape and polarity of compound (III) contribute to more efficient crystal packing compared to (IV).
  • Efficient molecular packing in (III) compensates for its lower molecular density, leading to similar crystal densities.
  • Crystal packing analysis provides insights into the density differences between related energetic materials.