Pulse Radiolysis Study of Reaction of OH Radicals with Triose Reductone

Abstract

Abstract The reaction between the hydroxyl radical (OH) and triose reductone (2,3-dihydroxy-2-propenal) in an aqueous solution has been studied by spectrophotometric pulse radiolysis. The OH radical adds to triose reductone (TRH2) to form the transient OH adduct (TRH(OH)−·) with an absorption maximum at 398 nm, ε=3150 M−1 cm−1 (1 M=1 mol dm−3) in a neutral solution. The OH adduct decays by second-order kinetics in the pH range 2–12. The rate constants for the reactions of the OH radical with dissociated and undissociated triose reductone are 1.4×1010 M−1 s−1 and 9.9×109 M−1 s−1, respectively. The dependence of the transient absorption on the pH shows that the OH adduct has a pKa value of 4.7.