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Electron self-exchange kinetics in two average-valence dicopper cryptates.

J L Coyle1, H Elias, E Herlinger

  • 1School of Chemistry, Queens University Belfast, Belfast BT9 5AG, UK.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|April 24, 2001
PubMed
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Electron self-exchange rates for dicopper cryptates are high, indicating outer-sphere mechanisms. Copper-copper bond dynamics do not limit redox reactions in these model compounds.

Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Coordination Chemistry

Background:

  • Dicopper cryptates are model compounds for studying electron transfer reactions.
  • Understanding electron self-exchange rates is crucial for elucidating reaction mechanisms.

Purpose of the Study:

  • To determine the electron self-exchange rates of two average-valence dicopper cryptates.
  • To investigate the reaction mechanism of these cryptates, including cross-exchange and oxidation reactions.
  • To assess the impact of copper-copper bond dynamics on redox processes.

Main Methods:

  • Kinetic studies of electron self-exchange reactions.
  • Measurement of cross-exchange reaction rates.
  • Oxidation studies using potassium cobalt(III) oxalate ([Co(ox)3]3-).

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Main Results:

  • Electron self-exchange rates were found to be around 10(5) M-1 s-1, which is high for small-molecule model compounds.
  • Cross-exchange and oxidation reaction rates are consistent with an outer-sphere reaction mechanism.
  • The self-exchange rate was not decreased for the cryptate requiring copper-copper bond making/breaking, indicating this is not rate-limiting.

Conclusions:

  • Dicopper cryptates exhibit fast electron self-exchange rates, characteristic of outer-sphere mechanisms.
  • Copper-copper bond dynamics are not a rate-limiting factor in the redox processes of these cryptates.
  • These findings contribute to the understanding of electron transfer in dicopper systems.