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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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Two-Electron Transfer Pathways.

Jiaxing Lin, D Balamurugan, Peng Zhang

  • 1‡Department of Physics, University of Cyprus, Nicosia 1678, Cyprus.

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|January 14, 2015
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Summary
This summary is machine-generated.

This study develops theoretical models for two-electron transfer, revealing how bridge structure influences multielectron superexchange and pathway interference. Findings may guide strategies for delivering multiple electrons in redox systems.

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Area of Science:

  • * Theoretical chemistry and physical chemistry.
  • * Focus on electron transfer mechanisms in molecular systems.

Background:

  • * Understanding multielectron transfer is crucial for advancing molecular systems chemistry.
  • * Single-electron superexchange is well-understood, but multiple-electron transfer pathways remain largely unexplored.
  • * Long-distance electron transfer often occurs via superexchange interactions through molecular bridges.

Purpose of the Study:

  • * To develop and analyze simple theoretical models for two-electron superexchange.
  • * To investigate the influence of bridge structure and energetics on multielectron superexchange.
  • * To compare the characteristics of two-electron superexchange with single-electron superexchange.

Main Methods:

  • * Development of simplified superexchange models for two-electron transfer.
  • * Analysis of pathway interference between singly and doubly oxidized/reduced virtual bridge states.
  • * Comparison of pathway topologies for one- and two-electron superexchange.

Main Results:

  • * Two-electron superexchange involves both one- and two-electron virtual intermediate states.
  • * Bridge structure and energetics significantly impact multielectron superexchange dynamics.
  • * Interference effects in two-electron transfer create complex pathway topologies, even in linear systems.

Conclusions:

  • * The developed models reveal rich phenomena in multielectron superexchange, including pathway interference.
  • * Findings suggest that manipulating pathways and crosstalk can control multielectron transfer.
  • * This work provides a foundation for designing systems for efficient multiple-electron delivery in condensed-phase redox processes.