Kinetics and mechanism of the photoinitiated autoxidation of sulfur(IV) in the presence of iodide ion

Ildikó Kerezsi, Gábor Lente, István Fábián

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The kinetics and mechanism of the photoinitiated and iodide ion-catalyzed aqueous autoxidation of sulfur(IV) has been studied in a diode-array spectrophotometer using the same light beam for excitation and detection. Light absorption of both the iodide ion and sulfur(IV) contribute to the initiation of a highly efficient radical chain reaction, the overall rate of which depends on the reactant and catalyst concentrations, the pH, and the light intensity in a complex manner. To interpret all the experimental findings, an elaborate scheme is proposed, in which the chain carriers are SO3-•, SO4-•, SO5-•, I , and I2-•. There are three termination steps, each of them is second-order with respect to the chain carriers. Model calculations and nonlinear fitting have been used to show that the proposed scheme gives an excellent quantitative interpretation of the experimental results.

Original languageEnglish
Pages (from-to)4230-4238
Number of pages9
JournalInorganic Chemistry
Volume46
Issue number10
DOIs
Publication statusPublished - May 14 2007

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Kinetics and mechanism of the photoinitiated autoxidation of sulfur(IV) in the presence of iodide ion'. Together they form a unique fingerprint.

  • Cite this