One electron transfer redox potentials of free radicals. I. The oxygen-superoxide system. Progress report, September 1, 1975--July 1, 1976

Technical Report · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7355047

Ilan, Y A; Czapski, G; Meisel, D

The method of determination of Redox potentials of radicals, using the pulse radiolysis technique, is outlined. The method is based on the determination of equilibria constants of electron transfer reactions between the radicals and appropriate acceptors. The limitations of this technique are discussed. The redox potentials of several quinones--semi-quinones are calculated, as well as the standard redox potential of the peroxy radical. E/sup 0//sub O/sub 2//O/sub 2//sup -/ = -0.33 V and the redox oxidation properties of the peroxy radical in various systems and pH are discussed. The value determined for the redox potentials of O/sub 2//O/sub 2//sup -/ is higher by more than 0.2 volts than earlier estimates, which has important implications on the possible role of O/sub 2//sup -/ in biological processes of O/sub 2/ fixation.

• Research Organization: Hebrew Univ., Jerusalem (Israel). Dept. of Physical Chemistry
• OSTI ID: 7355047
• Report Number(s): COO-3221-35
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AROMATICS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTRON TRANSFER
IRRADIATION
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PEROXY RADICALS
PULSED IRRADIATION
QUINONES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REDOX POTENTIAL