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Design of a Peripheral Building Block for H-Bonded Dendritic Frameworks and Analysis of the Void Space in the Bulk

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Three novel dendrimers with amide peripheral groups exhibit high surface areas and sorption properties due to supramolecular assembly via hydrogen bonds, creating tunable voids for applications like gas separation.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Dendrimers are highly branched macromolecules with unique properties.
  • Amide groups can participate in hydrogen bonding, influencing material structure.
  • Controlling void spaces in dendrimers is key for functional applications.

Purpose of the Study:

  • To synthesize and characterize novel dendrimers with 3,5-di-tert-butyl amidobenzene peripheral moieties.
  • To investigate the relationship between dendrimer structure, supramolecular assembly, and sorption properties.
  • To explore the potential of these dendrimers for gas separation and catalysis.

Main Methods:

  • Synthesis and characterization of three dendrimers with varying generations.
  • BET surface area analysis.
  • X-ray crystallography, FT-IR, and powder-XRD for structural elucidation.
  • CO2 sorption studies to determine isosteric heats (Qst).

Main Results:

  • Dendrimers were prepared in good yields (64-83%) with high BET surface areas (136-138 m²/g).
  • Intermolecular hydrogen bonding of peripheral amide groups dictates supramolecular assembly, creating voids.
  • CO2 sorption heats varied, indicating different void types and potential for tunable properties.

Conclusions:

  • The peripheral amide groups drive supramolecular assembly through H-bonds, creating interstitial voids.
  • These voids are responsible for the observed sorption properties.
  • The void space can be engineered for specific applications like gas separation and catalysis.