Journal of Physical Chemistry p. 6519 - 6524 (1995)
Update date:2022-08-28
Topics:
Mohan, Hari
Mittal, Jai P.
A transient optical absorption band (λmax=325 nm) is formed upon reaction of . OH radical with bromobenzene in neutral aqueous solution and is assigned to the OH adduct.In strongly acidic solution (HClO4 > 3 mol dm3), the OH adduct undergoes H+-catalyzed dehydroxylation to form the bromobenzene radical cation.This radical cation absorbs at 550 nm and at 270-310 nm.Even at this high H+ concentration, only a fraction of the OH adduct is converted to the radical cation.SO4.- reacts with bromobenzene to form the hydroxycyclohexadienyl radical (λmax=325 nm) and the phenoxyl radical (λmax=400 nm).The bromobenzene radical cation is also observed in irradiated 1,2-dichloroethane solutions.C6H5Br.+ is a strong one-electron oxidant and oxidizes Br-, SCN-, and organic sulfides with high rate constants.C6H5Br.+ undergoes electron transfer reaction with Cl- to establish an equilibrium, from which a reduction potential value for C6H5Br.+/C6H5Br was determined to be 2.31+/-0.15 V versus NHE.
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