Pulse Radiolysis Studies on Methyl Methylthiomethyl Sulfoxide in Aqueous Solutions

doi:10.1246/bcsj.55.2347

Paper

Pulse Radiolysis Studies on Methyl Methylthiomethyl Sulfoxide in Aqueous Solutions

Published Aug 1, 1982 · DOI · T. Sumiyoshi, N. Miura, M. Aikawa

Bulletin of the Chemical Society of Japan

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Abstract

Reaction mechanisms between methyl methylthiomethyl sulfoxide (MTMSO) and hydrated electron (eaq−) or hydroxyl radical (OH· radical) have been studied in aqueous solutions with various pH values by means of pulse radiolysis technique. The acid and basic components of equilibrium(Remark: Graphics omitted.)and(Remark: Graphics omitted.)are formed for the reaction of eaq−+CH3SCH2SOCH3 and OH· +CH3SCH2SOCH3, respectively. The pKa values of the respective equilibrium are 10 and 9. The anion (I) and (II) have absorption maxima at 375 nm and 360 nm, respectively. The sulfinic acid CH3SCH2SO2− is also formed in the reaction of CH3SCH2SOCH3+OH·. The rate constants have been determined to be k(eaq−+MTMSO)=1.3×108 M−1 s−1 and k(OH· +MTMSO)=3.1×109 M−1 s−1 (1 M=1 mol dm−3). Relative reactivities of OH· radical with thio-methyl bond and sulfinyl group are also discussed.

Study Snapshot

Pulse radiolysis studies reveal that methyl methylthiomethyl sulfoxide reacts with hydrated electrons and hydroxyl radicals to form acid and basic components, with pKa values of 10 and 9.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Pulse Radiolysis Studies on Methyl Methylthiomethyl Sulfoxide in Aqueous Solutions

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