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Reduction of hexachloroiridate (IV) by benzene-1,2-diol in aqueous perchloric acid

✍ Scribed by D. F. C. Morris; T. J. Ritter

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
305 KB
Volume
11
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

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 monoaquopentachloroiridate (III) is formed also at the higher [catechol]/[IrCl~6~^2−^]ratios.

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