Pulse radiolysis study of the kinetics and mechanisms of the reactions between manganese(II) complexes and HO/sub 2//O/sub 2//sup -/ radicals. 1. Sulfate, formate, and pyrophosphate complexes

Journal Article · Thu Jul 05 04:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150658a037· OSTI ID:6594002

Cabelli, D E; Bielski, B H.J.

The reactions between Mn/sup 2 +/ and HO/sub 2//O/sub 2//sup -/ were studied in the presence of pyrophosphate, sulfate, or formate ligands. Manganous pyrophosphate is oxidized to manganic pyrophosphate by both HO/sub 2/ and O/sub 7//sup -/ at pH-dependent rates where k/sub 6/ varies from 3 x 10/sup 5/ to 2 x 10/sup 7/ M/sup -1/ s/sup -1/ in the pH range of 0.1-7.2. The sulfate and formate complexes both react to yield the transient species MnO/sub 2//sup +//MnOOH/sup 2 +/; MnO/sub 2//sup +/ eventually disappears by complex processes while MnOOH/sup 2 +/ reacts with additional Mn/sup 2 +/ to form a dinuclear species, MnOOHMn/sup 4 +/, and/or oxidizes to Mn/sup 3 +/. Reaction kinetics have been established from pH 1 to 7 for these two systems.

• Research Organization: Brookhaven National Lab., Upton, NY
• OSTI ID: 6594002
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:14; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
COMPLEXES
DATA
DATA ANALYSIS
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
FORMATES
HYDROGEN COMPOUNDS
HYDROPEROXY RADICALS
INFORMATION
KINETICS
MANGANESE
MANGANESE COMPLEXES
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
PHOSPHORUS COMPOUNDS
PYROPHOSPHATES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
SPECTRA
SULFATES
SULFUR COMPOUNDS
SUPEROXIDE RADICALS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
WATER