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Solution, Solubility, and Solubility Equilibrium
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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
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Porous Organic Salts: Diversifying Void Structures and Environments.

Takahiro Ami1, Kouki Oka1, Keiho Tsuchiya1

  • 1Department of Applied Chemistry and Center for Future Innovation (CFi), Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.

Angewandte Chemie (International Ed. in English)
|May 3, 2022
PubMed
Summary

Researchers developed diamondoid porous organic salts (d-POSs) with tunable pore environments. Fluorinated d-POSs show exceptional CO2 capture capacity, highlighting their potential for gas adsorption applications.

Keywords:
Gas AdsorptionOrganic CrystalsPorous Organic SaltsRecrystallizationVoid Structures

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Chemical Engineering

Background:

  • Porous organic salts (POSs) are self-assembled materials with high solubility and recyclability.
  • Their porous structures are formed through charge-assisted hydrogen bonding between sulfonic acids and amines.
  • POSs offer potential for various applications due to their tunable properties.

Purpose of the Study:

  • To construct novel diamondoid porous organic salts (d-POSs) using a tetrahedral tetrasulfonic acid and triphenylmethylamine (TPMA).
  • To investigate the effect of substituents on TPMA on the structure and gas adsorption properties of d-POSs.
  • To explore the potential of these d-POSs for selective gas capture.

Main Methods:

  • Synthesis of d-POSs by combining a tetrahedral tetrasulfonic acid with substituted TPMA.
  • Characterization of the d-POS structures and pore environments.
  • Gas adsorption measurements, particularly for CO2, under various conditions.

Main Results:

  • Successful construction of d-POSs with rigid diamond networks.
  • Introduction of substituents (F, Cl, Br, I) on TPMA led to distorted networks and varied void structures.
  • Fluorinated d-POS exhibited a record CO2 adsorption capacity of 182 mL(STP)/g at 1 atm among all-organic porous materials.
  • Adsorption behavior was significantly influenced by the void structures and surface chemistry.

Conclusions:

  • Substituent engineering of TPMA provides a route to tailor the pore environment and gas adsorption properties of d-POSs.
  • The developed fluorinated d-POS demonstrates superior CO2 capture performance.
  • These findings highlight the potential of d-POSs as advanced materials for gas separation and storage.