Mechanisms of the dismutation of superoxide catalyzed by Cu(II)-phenanthroline complex and of the oxidation of Cu(I)-phenanthroline complex by oxygen in aqueous solution. Progress report, July 1982-June 1983

Technical Report · Sat Jan 01 00:00:00 EST 1983

OSTI ID:6203486

Goldstein, S; Czapski, G

Using the technique of pulse radiolysis to generate O/sub 2//sup -/, the catalytic effect of copper 1,10 phenanthroline, ((op)/sub 2/Cu/sup 2 +/), on the dismutation of O/sub 2//sup -/ in aqueous solution was studied. The rate constants of the reduction of (op)/sub 2/Cu/sup 2 +/ and oxidation of (op)/sub 2/Cu/sup +/ by O/sub 2//sup -/ have been determined to be (1.93 +- 0.07) 10/sup 9/M/sup -1/s/sup -1/ and (2.95 +- 0.3) 10/sup 8/ M/sup -1/s/sup -1/, respectively. The turnover rate constant, k/sub cat/, has been calculated to be (5.1 +- 0.9) 10/sup 8/ M/sup -1/s/sup -1/. The reaction mechanism for the oxidation of (op)/sub 2/Cu/sup +/ by molecular oxygen in aqueous solutions has been investigated and the rate constant k/sub -10/ = (5.0 +- 0.3) 10/sup 4/ M/sup -1/s/sup -1/ has been determined. The rate constant of the oxidation of (op)/sub 2/Cu/sup +/ by H/sub 2/O/sub 2/ was measured to be k/sub 22/ = (937 +- 20) M/sup -1/s/sup -1/.

• Research Organization: Hebrew Univ., Jerusalem (Israel). Dept. of Physical Chemistry
• DOE Contract Number: AC02-76EV03221
• OSTI ID: 6203486
• Report Number(s): DOE/EV/03221-77; ON: DE83013388
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
COPPER COMPLEXES
CATALYTIC EFFECTS
SUPEROXIDE RADICALS
OXIDATION
REDUCTION
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
HYDROGEN PEROXIDE
PULSED IRRADIATION
RADIOLYSIS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
DECOMPOSITION
DISPERSIONS
HYDROGEN COMPOUNDS
INFORMATION
IRRADIATION
KINETICS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
PEROXIDES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
REACTION KINETICS
SOLUTIONS
TRANSITION ELEMENT COMPLEXES
400600* - Radiation Chemistry