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Marcus kinetics control singlet and triplet oxygen evolving from superoxide.
Soumyadip Mondal1, Huyen T K Nguyen1,2, Robert Hauschild1
1Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria.
Nature
|October 3, 2025
Summary
Scientists discovered that controlling the release of triplet or singlet oxygen depends on reaction conditions. Increasing reaction driving force favors singlet oxygen, crucial for understanding energy storage and biological processes.
Area of Science:
- Chemistry
- Biochemistry
- Materials Science
Background:
- Oxygen redox chemistry is fundamental to life and technology.
- Reactive oxygen species, like singlet oxygen, can be harmful.
- Factors controlling singlet oxygen formation remain unclear.
Purpose of the Study:
- Investigate the factors governing triplet versus singlet oxygen formation.
- Understand the spin states and kinetics of oxygen redox reactions.
Main Methods:
- Examined Marcus normal and inverted region behavior in oxygen redox reactions.
- Studied superoxide disproportionation in various systems.
- Analyzed the role of Lewis and Brønsted acidity.
Main Results:
- Triplet and singlet oxygen release follows Marcus behavior.
- Increasing reaction driving force shifts dominance from triplet to singlet oxygen.
- Singlet oxygen yields are controllable and relevant to batteries and cellular organelles.
Conclusions:
- Singlet oxygen formation is predictable and controllable.
- Findings offer insights into managing oxygen redox chemistry in diverse applications.
- Implications for life sciences, chemistry, and energy storage.
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