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Related Experiment Videos

Long-range electron transfer.

Harry B Gray1, Jay R Winkler

  • 1Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA. hbgray@caltech.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 2, 2005
PubMed
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Electron tunneling rates are controlled by nuclear and electronic factors. Stronger couplings via covalent and hydrogen bonds, compared to van der Waals gaps, influence electron transfer through diverse molecular media.

Area of Science:

  • Physical Chemistry
  • Molecular Biophysics
  • Electron Transfer

Background:

  • Long-range electron tunneling is crucial for biological and chemical processes.
  • Understanding factors controlling electron transfer rates is essential.

Purpose of the Study:

  • To elucidate the nuclear and electronic factors governing electron tunneling rates.
  • To investigate the influence of molecular media structure on tunneling.

Main Methods:

  • Analysis of electron tunneling through molecular glasses and donor-bridge-acceptor complexes.
  • Comparison of coupling strengths across different types of atomic interactions.

Main Results:

  • Identified nuclear and electronic factors controlling electron tunneling rates.

Related Experiment Videos

  • Demonstrated that covalent and hydrogen bonds provide stronger coupling than van der Waals gaps.
  • Showed dependence of tunneling rates on the intervening medium's structure.

    • Conclusions:

    • The structure of the medium significantly impacts electron tunneling.
    • Differences in atomic coupling (bonded vs. nonbonded) explain observed tunneling rate variations.
    • Findings are relevant for understanding electron transfer in Ru-modified proteins and protein complexes.