Mechanistic investigations with Bromamine-T: Kinetics of oxidation of thiocyanate ion |
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| Authors: | B. Thimme Gowda and J. Ishwara Bhat |
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| Affiliation: | (1) Department of Post-graduate Studies and Research in Chemistry, Mangalore University, 574199 Mangalagangothri, India;(2) Department of Chemistry, Govinda Dasa College, Suratkal, 574158, D. K. Karnataka, India |
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| Abstract: | The kinetics of oxidation of thiocyanate ion by Bromamine-T (BAT) has been investigated in alkaline medium. The rate of reaction is first order in [OH–] and zero order in [NCS–]. The pseudo-first order rate constants decrease with increase in [BAT]. Addition of the reaction products p-toluenesulfonamide, Br– and neutral salts has no significant effect on the rate. The rate increases with either increase in ionic strength or decrease in dielectric constant of the medium. The activation parameters have been computed. A mechanism consistent with the experimental results has been proposed and the rate law derived. The rate constants predicted from the rate law for the variation of [BAT] are in excellent agreement with the observed rate constants.
                - (BAT)      .     [OH–]  [NCS–].   [BAT].   - , Br–   .  .     .  , , . , , [BAT]o, .
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