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Reduction of hexachloroiridate (IV) by benzene‐1,2‐diol in aqueous perchloric acid
Author(s) -
Morris D. F. C.,
Ritter T. J.
Publication year - 1979
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550111006
Subject(s) - chemistry , perchloric acid , perchlorate , reaction rate constant , catechol , aqueous solution , kinetics , benzene , electron transfer , reaction mechanism , inorganic chemistry , photochemistry , organic chemistry , ion , catalysis , physics , quantum mechanics
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.