Cited by 2,123Free Radicals and AntioxidantsAdvanced oxidation water treatmentPhotochemistry and Electron Transfer Studies

Reduction potentials of one-electron couples involving free radicals in aqueous solution

Wardman, Peter·1989·Journal of Physical and Chemical Reference Data

Abstract

Reduction of an electron acceptor (oxidant), A, or oxidation of an electron donor (reductant), A2−, is often achieved stepwise via one-electron processes involving the couples A/A⋅− or A⋅−/A2− (or corresponding prototropic conjugates such as A/AH⋅ or AH⋅/AH2). The intermediate A⋅−(AH⋅) is a free radical. The reduction potentials of such one-electron couples are of value in predicting the direction or feasibility, and in some instances the rate constants, of many free-radical reactions. Electrochemical methods have limited applicability in measuring these properties of frequently unstable species, but fast, kinetic spectrophotometry (especially pulse radiolysis) has widespread application in this area. Tables of ca. 1200 values of reduction potentials of ca. 700 one-electron couples in aqueous solution are presented. The majority of organic oxidants listed are quinones, nitroaryl and bipyridinium compounds. Reductants include phenols, aromatic amines, indoles and pyrimidines, thiols and phenothiazines. Inorganic couples largely involve compounds of oxygen, sulfur, nitrogen and the halogens. Proteins, enzymes and metals and their complexes are excluded.

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Crossref · 10.1063/1.555843

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  • There are two standard redox potentials for O2•−: E′(O2/O2•−) = 0.33 V and E′(O2•−/H2O2) = 0.93 V.

    “There are two standard redox potentials for O2•− showing that it can act as a reducing agent E′(O2/O2•−) = 0.33 V or as an oxidizing agent E′(O2•−/H2O2) = 0.93 V [15]), Figure 4.”

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Authors
Wardman, P.
Affiliations
Mount Vernon Hospital (GB)
Corresponding author
Wardman, Peter
Venue
Journal of Physical and Chemical Reference Data
Published
1989-10-01
Volume
18
Issue
4
Pages
1637-1755
ISSN
  • 0047-2689 (ISSN-L)
  • 1529-7845
OpenAlex
W1979424160
Cited by
2,123
References
3
Citations by year
2026: 66 · 2025: 63 · 2024: 99 · 2023: 76 · 2022: 96 · 2021: 114 · 2020: 77 · 2019: 88 · 2018: 81 · 2017: 96 · 2016: 80 · 2015: 80 · 2014: 77 · 2013: 71 · 2012: 61
FWCI
19.63
Type
journal article
Language
en
Open access
closed
Locations
Journal of Physical and Chemical Reference Data (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
redox potential, free radicals, aqueous solutions, electron transfer, quinones, nitroaromatic compounds, phenols, aromatic amines, indole, pyrimidines, thiols, phenothiazines, inorganic oxidants, redox couples

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