Pulse radiolysis studies on methyl methylthiomethyl sulfoxide in aqueous solutions.
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概要
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Reaction mechanisms between methyl methylthiomethyl sulfoxide (MTMSO) and hydrated electron (e<SUB>aq</SUB><SUP>−</SUP>) 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<BR>(<U>Remark: Graphics omitted.</U>)<BR>and<BR>(<U>Remark: Graphics omitted.</U>)<BR>are formed for the reaction of e<SUB>aq</SUB><SUP>−</SUP>+CH<SUB>3</SUB>SCH<SUB>2</SUB>SOCH<SUB>3</SUB> and OH· +CH<SUB>3</SUB>SCH<SUB>2</SUB>SOCH<SUB>3</SUB>, respectively. The p<I>K</I><SUB>a</SUB> 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 CH<SUB>3</SUB>SCH<SUB>2</SUB>SO<SUB>2</SUB><SUP>−</SUP> is also formed in the reaction of CH<SUB>3</SUB>SCH<SUB>2</SUB>SOCH<SUB>3</SUB>+OH·. The rate constants have been determined to be <I>k</I>(e<SUB>aq</SUB><SUP>−</SUP>+MTMSO)=1.3×10<SUP>8</SUP> M<SUP>−1</SUP> s<SUP>−1</SUP> and <I>k</I>(OH· +MTMSO)=3.1×10<SUP>9</SUP> M<SUP>−1</SUP> s<SUP>−1</SUP> (1 M=1 mol dm<SUP>−3</SUP>). Relative reactivities of OH· radical with thio-methyl bond and sulfinyl group are also discussed.
- 公益社団法人 日本化学会の論文
著者
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Sumiyoshi Takashi
Department Of Atomic Science And Nuclear Engineering Faculty Of Engineering Hokkaido University
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Katayama Meiseki
Department Of Atomic Science And Nuclear Engineering Faculty Of Engineering Hokkaido University
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Miura Nobuyuki
Department of Atomic Science and Nuclear Engineering, Hokkaido University
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Aikawa Masayuki
College of General Education, Hokkai Gakuen University
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