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Intermolecular electron transfer by quantum mechanical tunneling.

J R Miller

    Science (New York, N.Y.)
    |July 18, 1975
    PubMed
    Summary
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    Electrons can transfer between molecules via quantum tunneling, even across inert solvents. This process is crucial for biological electron transport when diffusion is hindered.

    Area of Science:

    • Biophysics
    • Quantum Chemistry

    Background:

    • Biological electron transport involves electron transfer between molecules.
    • Quantum mechanical tunneling is a proposed mechanism for this transfer.

    Purpose of the Study:

    • To investigate electron transfer between aromatic molecules in a rigid matrix.
    • To provide evidence for quantum tunneling in biological systems.

    Main Methods:

    • Studied electron transfer between aromatic molecules.
    • Utilized a rigid matrix to immobilize reactants.
    • Analyzed reaction kinetics.

    Main Results:

    • Observed electron transfer over distances of tens of angstroms.
    • Kinetics data support quantum tunneling as the mechanism.

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  • Demonstrated electron tunneling through inert solvent molecules.

    • Conclusions:

    • Quantum mechanical tunneling facilitates electron transfer between molecules.
    • This mechanism is significant in biological electron transport, especially when diffusion is limited by steric factors or immobilization.