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Electron Transfer. 134. Reduction of Bound Ruthenium(III) by Indium(I)(1).

Swapan K. Chandra1, Edwin S. Gould

  • 1Department of Chemistry, Kent State University, Kent, Ohio 44242.

Inorganic Chemistry
|July 30, 1997
PubMed
Summary

Hypovalent indium(I) reacts with ruthenium(III) complexes, forming indium(II) intermediates. This reaction, studied via kinetics, suggests ligand effects on redox potential are metal-independent, aiding electron transfer studies.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Reaction Kinetics

Background:

  • Indium(I) is a hypovalent species with unique reactivity.
  • Ruthenium(III) ammine complexes serve as effective oxidants.
  • Understanding electron transfer mechanisms is crucial in inorganic chemistry.

Purpose of the Study:

  • To investigate the reaction kinetics between indium(I) and ruthenium(III) ammine complexes.
  • To explore the role of ligands in modulating redox potentials.
  • To apply the Marcus model for estimating electron self-exchange rates.

Main Methods:

  • Spectrophotometric monitoring of reaction progress.
  • Kinetic analysis of reaction profiles.
  • Application of the Marcus electron transfer theory.

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Main Results:

  • The reaction proceeds via a two-step mechanism involving a metastable indium(II) intermediate.
  • Rate constants show proportionality to reductions of cobalt(III) analogs, indicating metal-independent ligand effects.
  • An electron self-exchange rate constant for indium(II/I) was estimated at 10^-9 M^-1 s^-1.

Conclusions:

  • Ligand-induced changes in redox free energy are largely independent of the metal center.
  • The estimated self-exchange rate for indium(II/I) is unusually low, suggesting significant structural changes upon oxidation.
  • This study provides insights into electron transfer processes involving hypovalent main group elements.