SCHEDULED MAINTENANCE
Kinetics and mechanisms of redox reactions in aqueous solution. Part 8. Osmium(VIII) catalysed oxidation of amino acids by alkaline hexacyanoferrate(III)
Abstract
Amino acids, in the presence of OsVIII as a catalyst, are oxidised by alkaline hexacyanoferrate(III) to aldehydes. There is a zero - order dependence in [Fe(CN)63–], an order less than unity in [amino acid], and a first-order dependence in [OsVIII] and [OH–]. The observed zero - order rate constant was independent of [Fe(CN)64–]. The proposed mechanism envisages the formation of a transient [OsO4(OH)2]2––amino acid complex prior to its rate-limiting interaction with hydroxide ion. The respective values of the equilibrium and rate-limiting constants are reported. The values of the enthalpy and entropy of activation in each case are also estimated.
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