Reactions of reducing radicals with 2- and 3-nitroanilines in aqueous solutions: a pulse radiolysis study

摘要

Reactions of 2- and 3-nitro anilines (2- and 3-NA) with e aq ? , H-atoms and one-electron reductants have been studied using pulse radiolysis in aqueous solutions. Reactions of e aq ? were found to be quite fast with both 2-NA and 3-NA resulting in their corresponding semi-reduced species which are reducing in nature. Reduction potentials for 2-NA/2-Na?′ have been estimated to be approx. ?0.56 Vvs. NHE and that for 3-NA/3-NA?? was found to be between ?0.185 V and ?0.45 Vvs. NHE. Semi-reduced 2-NA has main absorption peak at 300 nm with a shoulder in the 350 nm region and a broad weak band in the 470–500 nm region, whereas semi-reduced 3-NA possesses an absorption peak at 520 nm. Reducing radicals such as (CH3)2 C?OH and CO 2 ?? reacted with 2-NA, producing semi-reduced species, whereas reactions of these radicals with 3-NA produced their corresponding radical-adduct species.