Kinetics of Oxidation of Indigo Carmine by N-Sodio-N- Bromotoluenesulfonamide in Acidic Buffer Medium
نویسندگان
چکیده
The kinetics of oxidation of indigo carmine (IC) by N-sodio-N-bromotoluenesulfonamide or bromamine-T (BAT) in pH 5 buffer medium has been investigated at 30°C using spectrophotometry at 610 nm. The reaction rate shows dependencies of first-order on [IC] 0 , second-order on [BAT]0, fractional order on [H 1], and inverse first-order on [p-toluenesulfonamide]. The addition of chloride and bromide ions, and the variation of ionic strength of the medium have no influence on the reaction rate. There is a negative effect of the dielectric constant of the solvent. Activation parameters have been calculated. A single-pathway mechanism for the reaction, consistent with the kinetic data, has been proposed. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 453–459, 1997
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