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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Trapping virtual pores by crystal retro-engineering.

Marc A Little1, Michael E Briggs1, James T A Jones1

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Researchers stabilized unstable porous molecular crystals by trapping

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Stable guest-free porous molecular crystals are rare.
  • Organic molecular crystals often exhibit 'virtual porosity,' where cavities collapse upon guest removal.

Purpose of the Study:

  • To develop a method for stabilizing unstable porous molecular crystals.
  • To trap and maintain the porous structure of low-density organic crystals.

Main Methods:

  • Introduced a second molecule to fill unstable voids in a low-density organic crystal.
  • Utilized a 'retro-engineering' strategy, analogous to organic retrosynthesis.
  • Formed a binary cocrystal to stabilize the porous structure.

Main Results:

  • Successfully trapped the metastable two-dimensional hexagonal pore structure.
  • The resulting cocrystal remained single crystalline and porous after guest removal.
  • Demonstrated a novel method for creating stable porous materials from unstable precursors.

Conclusions:

  • The 'retro-engineering' strategy effectively stabilizes virtual porosity in molecular crystals.
  • Cocrystal formation is a viable approach to create robust porous materials.
  • This work expands the possibilities for designing stable porous organic frameworks.