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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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Structural Distortions and Magnetic Ordering in <i>Ae</i><sub>2</sub>FeO<sub>3</sub>Cu<i>Ch</i> (<i>Ae</i> = Ca, Sr; <i>Ch</i> = S, Se) Oxide Chalcogenides.

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Anionic Redox Topochemistry for Materials Design: Chalcogenides and Beyond.

Shunsuke Sasaki1, Simon J Clarke2, Stéphane Jobic1

  • 1Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France.

ACS Organic & Inorganic Au
|February 12, 2024
PubMed
Summary

Anionic redox topochemistry enables novel solid-state reactions in non-van der Waals materials. This "zipper-like" process facilitates the creation of new 2D metal chalcogenides and layered structures.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Inorganic chemistry

Background:

  • Topochemistry involves solid-state reactions with structural links between precursors and products.
  • Low-dimensional materials undergo stepwise transformations via guest atom/molecule intercalation, driven by redox reactions.
  • Cationic redox topochemistry is key for applications like Li-ion batteries and tuning layered transition metal compounds.

Purpose of the Study:

  • To explore materials design beyond traditional cationic redox topochemistry.
  • To investigate new topochemical reactions in non-van der Waals (vdW) compounds.
  • To enable the synthesis of novel 2D metal chalcogenides and layered structures.

Main Methods:

  • Focus on non-vdW compounds with 2D arrays of anionic chalcogen dimers and redox-inert cationic layers.
  • Exploiting redox reactions of chalcogen dimers with external metal elements.
  • Utilizing a "zipper-like" mechanism involving reductive cleavage of chalcogen-chalcogen bonds.

Main Results:

  • Demonstrated anionic redox topochemistry in non-vdW materials.
  • Achieved metal insertion to form 2D metal chalcogenides.
  • Enabled chalcogen deintercalation, leading to novel layered structures.
  • Successfully created new structures through reductive cleavage of anionic bonds.

Conclusions:

  • Anionic redox topochemistry offers a new pathway for materials synthesis beyond vdW systems.
  • This approach allows for the construction of novel 2D metal chalcogenides and layered materials.
  • Challenges in synthesis and characterization of these new materials remain.