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The kinetics of the reaction between benzene-1,2-diol(catechol) and hexachloroiridate (IV) have been measured in aqueous acidic perchlorate solutions by the stopped-flow method. The reaction is second order overall, and first order in each reactant. A reverse reaction also occurs, but it is much slower than the forward process. Observed rate constants are dependent on acidity, but the variation can be attributed to activity rather than mechanistic effects. The reaction appears to proceed predominantly by an outer sphere electron transfer mechanism. yielding o-benzoquinone and hexachloroiridate (III), although rnonoaquopentachloroiridate (111) is formed also a t the higher (catechol]/[IrC~~-] ratios.

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Die Kinetik der Reaktionen der Komplexe (I) wird spektrophotometrisch in Abhängigkeit von [H ] und der Konzentration an zugesetzten Salzen untersucht.