Spectral, kinetics, and redox properties of the transients formed on one-electron oxidation of 4,4′-thiodiphenol: A pulse radiolysis study
✍ Scribed by H. Mohan; J. P. Mittal
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 162 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
The transient absorption bands dm 3 9 Ϫ1 ( ϭ 330, 525 nm, k ϭ 5 ϫ 10 mol max f obtained on pulse radiolysis of N 2 O-saturated neutral aqueous solution of 4,4Ј-thiodi-Ϫ1 s ) phenol (TDPH) are due to the reaction of TDPH with иOH radicals and are assigned to phenoxyl radical formed on fast deprotonation of the solute radical cation. The reaction of specific oneelectron oxidants (Cl 2 и Ϫ , Br 2 и Ϫ , N 3 и, TI 2ϩ , CCl 3 OOи) with TDPH also produced similar transient absorption bands. The phenoxyl radicals are also produced on pulse radiolysis of N 2 -saturated solution of TDPH in 1,2-dichloroethane. The nature of transient absorption spectrum obtained on reaction of иOH radicals with TDPH is not affected in acidic solutions, showing that OH- adduct is not formed in neutral solutions. The oxidation potential for the formation of phenoxyl radical is determined to be