β-Cyclodextrin-catalyzed decomposition of Caro's acid

✍ Scribed by M. S. Ramachandran; Lathakannan

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 137 KB
• Volume: 34
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.10066

✦ Synopsis

Abstract

The kinetics and mechanism of decomposition of peroxomonosulphate (PMS) in aqueous sodium hydroxide medium in the presence β‐cyclodextrin has been investigated. The rate of decomposition of PMS is considerably enhanced by the added β‐cyclodextrin. The reaction follows first order kinetics with respect to [PMS]. The experimental results suggest the formation of β‐cyclodextrin peroxy anion by the interaction between SO~5~^2−^, and β‐cyclodextrin anion (BCDO^−^). β‐Cyclodextrin peroxy anion subsequently reacts with PMS to give O~2~, SO~4~^2−^ and β‐cyclodextrin anion. The rate constant for the β‐cyclodextrin‐catalyzed decomposition of SO~5~^2−^ (BCD + SO~5~^2−^) is of the same order of magnitude as that of the reaction HSO~5~^2−^ + SO~5~^2−^ products. © 2002 Wiley Periodic mals, Inc. Int J Chem Kinet 34: 508–513, 2002