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Chlorophyll a π‐Cation Radical as Redox Mediator in Superoxide Dismutase (SOD) Mimetics
Author(s) -
Orzeł Łukasz,
RutkowskaZbik Dorota,
Eldik Rudi,
Fiedor Leszek,
Stochel Grażyna
Publication year - 2021
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.202000777
Subject(s) - chemistry , superoxide dismutase , reactive oxygen species , redox , photochemistry , chlorophyll , superoxide , oxygen , electron transfer , inorganic chemistry , biochemistry , antioxidant , enzyme , organic chemistry
The extensive speciation of copper(II) chloride in organic solvents varies with concentration, temperature, pressure and oxygen content, providing the ability to switch between different chlorophyll transmetalation pathways. We found that one of them is exceptionally suitable for the formation and stabilisation of the chlorophyll π‐cation radical. This is due to unique redox cycling, which is coupled to the generation and transformation of various reactive oxygen species. In the presence of a proton donor, our system shows behavior which resembles that of superoxide dismutase (SOD). Regardless of light, chlorophyll acts as an electron transfer mediator.