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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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pH Controls Charge Localization in Redox-Active Ladder Polymers.

Ana De La Fuente Durán1, Nicholas Siemons1, Adam Marks1

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|February 25, 2026
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Summary
This summary is machine-generated.

The pH of an electrolyte significantly impacts the redox behavior of organic mixed ionic-electronic conducting polymers (OMIECs), like poly(benzimidazobenzophenanthroline) (BBL). This study reveals that proton-coupled redox states, not just salt cation-coupled states, are crucial in neutral to basic conditions.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Organic mixed ionic-electronic conducting polymers (OMIECs) are key materials for advanced electronics.
  • Their chemical structures are tailored to control charge localization and orbital energetics.
  • Poly(benzimidazobenzophenanthroline) (BBL) is an archetypal ladder OMIEC.

Purpose of the Study:

  • To investigate the influence of electrolyte pH on the redox behavior of the BBL polymer.
  • To elucidate the redox mechanism of BBL under varying pH conditions.
  • To challenge the assumption that protons do not participate in redox processes in neutral to basic electrolytes.

Main Methods:

  • Electrochemical characterization
  • Operando Raman spectroscopy
  • Ab initio simulations
  • Electrochemical modeling using a multicomponent regular solution framework

Main Results:

  • BBL's redox behavior is fundamentally modulated by electrolyte pH, even under neutral to basic conditions.
  • Competitive formation of distinct proton-coupled and salt cation-coupled redox states was observed.
  • Proton-coupled redox dominates at neutral pH, contrary to previous assumptions of salt-compensated bipolaronic reduction.

Conclusions:

  • The redox properties of n-type ladder OMIECs like BBL are complex and significantly influenced by pH.
  • A modified Pourbaix diagram illustrates the tunable balance between proton-coupled and salt cation-coupled states via pH and potential.
  • Understanding pH effects is crucial for controlling aqueous electrochemical reactions involving OMIECs.