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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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A Porous Chalcogen-Bonded Organic Framework.

Brian J Eckstein1, Loren C Brown2, Bruce C Noll3

  • 1Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States.

Journal of the American Chemical Society
|November 24, 2021
PubMed
Summary
This summary is machine-generated.

Chalcogen bonding, a type of σ-hole bonding, is demonstrated as a viable connectivity mode for creating novel porous organic frameworks (ChOFs). This discovery expands the diversity of framework materials beyond established classes.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Material properties are dictated by atomic/molecular bonding.
  • Porous frameworks exhibit diverse properties based on connectivity.
  • Existing framework classes have limitations, necessitating new bonding modes.

Purpose of the Study:

  • To explore chalcogen bonding as a novel connectivity mode in porous frameworks.
  • To demonstrate the templating of lattice structures using chalcogen bonding.
  • To rationalize solvent conditions for creating molecularly programmed porous chalcogen-bonded organic frameworks (ChOFs).

Main Methods:

  • Crystallization studies using triptycene tris(1,2,5-selenadiazole).
  • Investigation of σ-hole bonding interactions.
  • Rationalization of solvent effects on framework formation.

Main Results:

  • Chalcogen bonding is confirmed as a viable connectivity mode for low-density porous frameworks.
  • Chalcogen bonding can template high-energy lattice structures.
  • Solvent conditions can be controlled to yield molecularly programmed porous chalcogen-bonded organic frameworks (ChOFs).

Conclusions:

  • σ-hole bonding, specifically chalcogen bonding, expands the diversity of porous framework materials.
  • This work provides the first evidence for using σ-hole bonding in framework construction.
  • Porous chalcogen-bonded organic frameworks (ChOFs) represent a new class of materials.