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Pulse radiolytic studies of aqueous Mn(CIO/sub 4/)/sub 2/ solutions

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100558a003· OSTI ID:7152549
Using Mn(ClO/sub 4/)/sub 2/, the reactions of Mn/sup 2 +/ with CO/sub 2//sup -/, e/sup -//sub aq/, OH, and O/sub 2//sup -/ were studied at pH 6.7. The following reaction rate constants were measured: k(Mn/sup 2 +/ + CO/sub 2//sup -/) less than 2 x 10/sup 5/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + e/sup -//sub aq/) = (9 +- 2) x 10/sup 6/ M/sup -1/ s/sup -1/ (ionic strength 0.15 to 0.5 M); k(Mn/sup 2 +/ + OH) = (3.4 +- 0.8) x 10/sup 7/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + O/sub 2//sup -/) = (1.1 +- 0.2) x 10/sup 8/ M/sup -1/ s/sup -1/ (0.01 M formate). O/sub 2//sup -/ radical ions react with Mn/sup 2 +/ and produce Mn/sup 3 +/ or MnO/sub 2//sup +/ ions. The reaction was found to be reversible, and an equilibrium constant K = (1.5 +- 0.6) x 10/sup 4/ M/sup -1/ was measured at pH 6.7. Mn/sup 2 +/, however, does not catalyze the dismutation of O/sub 2//sup -/. The disproportionation of Mn(III) (as MnOH/sup 2 +/) and the subsequent nucleation of the product MnO/sub 2/ are reported.
Research Organization:
Hebrew Univ., Jerusalem
OSTI ID:
7152549
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 80:17; ISSN JPCHA
Country of Publication:
United States
Language:
English