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Omar Barreda1, Gianluca Bannwart1, Glenn P A Yap1

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Porous materials are crucial for gas storage and separation.
  • Controlling the structure and properties of porous materials is an ongoing challenge.
  • Paddlewheel-based molecular assemblies offer tunable frameworks.

Purpose of the Study:

  • To investigate the effect of alkoxide chain length on the synthesis and properties of porous paddlewheel-based molecular assemblies.
  • To explore the gas adsorption capabilities of these functionalized materials.
  • To assess their potential for hydrocarbon separation.

Main Methods:

  • Synthesis of isophthalic acid ligands functionalized with varying linear alkoxide groups (ethoxy to pentoxy).
  • Characterization of the resulting two-dimensional materials (tetragonal and hexagonal phases).
  • Measurement of Brunauer-Emmett-Teller (BET) surface areas and gas adsorption isotherms.
  • Determination of isosteric heats of adsorption for hydrocarbon/gas mixtures.

Main Results:

  • Alkoxide chain length influences the formation of tetragonal or hexagonal two-dimensional materials, with longer chains favoring hexagonal.
  • Discrete, soluble molecular species were obtained through precise reaction control.
  • Achieved BET surface areas ranged from 125 m²/g to 545 m²/g.
  • The pentoxide-based assembly demonstrated selective adsorption for hydrocarbons.

Conclusions:

  • Functionalization of isophthalic acid ligands provides a route to tune the structure and properties of porous molecular assemblies.
  • The synthesized materials exhibit significant surface areas and potential for gas adsorption applications.
  • The pentoxide-based material shows promise for efficient hydrocarbon separation, evidenced by high isosteric heats of adsorption for ethylene and ethane.