Kinetics of the oxidation of the azidopenta-aquochromium(III) ion by nitrous acid in aqueous acidic perchlorate and chloride media, and analysis of the chromium(III) product distribution in the presence of scavenger anions

Abstract

The reaction between Cr(H₂O)₅N₃²⁺ and nitrous acid has been studied in an attempt to generate the five-coordinate intermediate, Cr(H₂O)₅³⁺. Experiments in the presence of scavenger anions (Cl^–, Br^–, NCS^–, or HSO₄^–) indicate that the intermediate is very reactive and has only a very small discriminating ability. The kinetics and mechanism of the reaction were studied by the stopped-flow method, in perchlorate and mixed perchlorate–chloride media.