Abstract
Abstract Kinetics of the oxidation of [Fe(terpy)2]2+, where 2,2′,2′′ -terpyridine is abbreviated as terpy, by ozone have been studied in acidic aqueous solution by the stopped-flow method. The reactions in pure perchloric acid solutions with excess ozone did not obey a simple first-order rate equation, but became nearly first-order in [Fe(terpy)2]2+, if ∼ 1O−2 M NaCl was added to the solutions. Moreover, the addition of NaCl accelerated the rate, which was independent of the pH and the concentration of Cl− added. The results provide evidence for the initiation of a one electron transfer reaction between [Fe(terpy)2]2+ and O3, forming the ozonide ion which decomposes rapidly to form the OH radical in acidic solutions. The role of Cl− is interpreted to scavenge the OH radical, and the resulting radical causes additional oxidation of [Fe(terpy)]2+.
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