Abstract
One electron oxidation of safranine T by specific oxidizing radicals such as Cl - 2, Tl 2+, Tl(OH) +, N . 3, Br - 2 etc. has been studied using the nanosecond pulse radiolysis technique. Reaction of free Br . atom has also been investigated at neutral pH. The semioxidized safranine species formed by these reactions have been shown to exist in two conjugate acid-base forms with p K a=4.0. Their spectral and kinetic parameters have been evaluated. Using N . 3/N - 3 and I - 2/2I - as reference couples, the one electron reduction potential of the semioxidized safranine has been determined to be 1.13±0.02 V vs NHE. The absorption spectra, second order decay rate constant and the p K a of the OH-reaction product revealed features quite different from that of the semioxidized species suggesting that the mode of OH reaction is not via electron abstraction.
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