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Excavations in molecular crystals.

Erwan Le Fur1, Eric Demers, Thierry Maris

  • 1Department de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada.

Chemical Communications (Cambridge, England)
|January 6, 2004
PubMed
Summary

Porous molecular crystals can expand their internal volume when reacting with specific agents. This process increases guest capacity without compromising the crystal structure, maintaining crystallinity.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Porous molecular networks offer tunable frameworks for molecular interactions.
  • Controlling guest accessibility within crystalline materials is crucial for applications like gas storage and separation.
  • Maintaining structural integrity during guest exchange or network modification is a significant challenge.

Purpose of the Study:

  • To investigate the controlled expansion of porous molecular crystals.
  • To demonstrate a method for increasing internal void volume without sacrificing crystallinity.
  • To explore the reaction of porous networks with cleaving agents.

Main Methods:

  • Synthesis of porous molecular crystals.
  • Exposure of crystals to reactive agents designed to cleave network fragments.
  • In-situ monitoring of structural changes and guest accessibility.
  • Crystallographic analysis to confirm structural integrity.

Main Results:

  • Single crystals of porous molecular networks were successfully treated with reactive agents.
  • The agents penetrated the crystal lattice and selectively cleaved network fragments.
  • This cleavage resulted in a measurable increase in the volume available for guest molecules.
  • Crucially, the overall crystallinity of the expanded networks was preserved.

Conclusions:

  • Porous molecular crystals can undergo controlled internal expansion via chemical cleavage.
  • This method provides a route to enhance guest capacity in crystalline materials while maintaining structural integrity.
  • The findings open new possibilities for designing advanced porous materials with tailored properties.

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