The one-electron oxidation of toluidine blue by specific oxidising radicals such as Cl2−, Tl(II), N3, Br2− etc. has been studied by employing the pulse radiolysis technique. The Br2− radical was found to be less efficient in oxidising toluidine blue as compared to Cl2−., Tl+2 and N3. The semioxidised species exhibited only onepKa indicating the presence of two conjugate acid-base forms whose spectral and kinetic features were evaluated. Reaction of OH radicals with the dye gave rise to a transient species which exhibited spectral and kinetic features different from that of the semioxidised species indicating that the mode of reaction of OH is different.
Volume 135, 2023
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