Abstract
Evidence from optical absorption pulse radiolysis experiments is presented for the existence of an oxidizing radical other than OH produced by the reaction of SF/sub 6/ and e/sup -//sub aq/. This radical is capable of oxidizing phenol and hydroquinone directly to phenoxyl and p-semiquinone ion radicals, respectively, even at neutral pH. From an analysis of the yield and kinetics of formation of the p-semiquinone ion it was found that the intermediate reacts with water with a rate constant of approximately 1.1 x 10/sup 5/ s/sup -1/. The reaction with hydroquinone has a rate constant of 1.7 x 10/sup 9/ M/sup -1/ s/sup -1/. Conductometric pulse radiolysis experiments are in agreement with the optical results. The radical .SF/sub 5/ is the simplest and most probable candidate for the oxidizing species. Sulfur hexafluoride can conveniently be used to introduce a strongly oxidizing radical into various systems where e/sup -//sub aq/ can be scavenged. This approach is demonstrated for methanol solution by the production of Br/sub 2//sup -/ from 10/sup -2/ M KBr.
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