Rate constants for reactions of iodine atoms in solution

Z. B. Alfassi, R. E. Huie, S. Marguet, E. Natarajan, P. Neta

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Laser flash photolysis (at 248 or 308 nm) or aryl iodides in water or water/methanol solutions produces iodine atoms and phenyl radicals. Iodine atoms react rapidly with added I to form I2 but do not react rapidly with O2 (k ⩽ 107 L mol−1 s−1). Iodine atoms oxidize phenols to phenoxyl radicals, with rate constants that vary from 1.6 × 107 L mol−1 s−1 for phenol to about 6 × 109 L mol−1 s−1 for 4‐methoxyphenol and hydroquinone. Ascorbate and a Vitamin E analogue are also oxidized very rapidly. N‐Methylindole is oxidized by I atoms to its radical cation with a diffusion‐controlled rate constant, 1.9 × 1010 L mol−1 s−1. Iodine atoms also oxidize sulfite and ferrocyanide ions rapidly but do not add to double bonds. The phenyl radicals, produced along with the I atoms, react with O2 to give phenylperoxyl radicals, which react with phenols much more slowly than I atoms. © 1995 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalInternational Journal of Chemical Kinetics
Volume27
Issue number2
DOIs
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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