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This study explores charge transport in hydrogen-bonded organic frameworks (HOFs). We measured conductivity in HOF-102 films, finding they support electrocatalysis due to efficient in-plane charge hopping.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Hydrogen-bonded organic frameworks (HOFs) are emerging materials for studying charge transport.
  • Understanding charge mobility in these systems is crucial for developing new electronic materials.

Purpose of the Study:

  • To investigate charge transport mechanisms and electrical conductivity in electrochemically active HOF-102 films.
  • To determine the potential for HOF-102 in applications like electrocatalysis.

Main Methods:

  • Utilized potential-step chronoamperometry to measure apparent diffusion coefficients and charge transfer rates.
  • Employed electrochemical impedance spectroscopy to assess film conductivity at various potentials.
  • Analyzed redox-hopping-based charge transport within the 2D plane of HOF-102.

Main Results:

  • HOF-102 films exhibit hopping-based conductivity in the 2D plane, driven by pyrene linker redox couples.
  • Measured in-plane charge diffusion coefficients (10⁻¹⁰–10⁻¹¹ cm²/s) and electrical conductivity (10⁻⁶–10⁻⁸ S/cm) are comparable to related materials.
  • Films demonstrate electrochromism due to the radical cation and dication states of the pyrene linkers.

Conclusions:

  • HOF-102 possesses sufficient charge transport and conductivity for potential electrocatalytic applications.
  • The material's structure facilitates in-plane charge movement while maintaining solvent and reactant access.
  • These findings highlight the promise of HOFs as conductive materials in supramolecular systems.