Autocatalysis-driven clock reaction II

Kinetics of the pentathionate-periodate reaction

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The pentathionate-periodate reaction has been investigated by spectrophotometrically monitoring the total amount of iodine evolved in the presence of phosphoric acid/dihydrogen phosphate buffer at 468 nm. The majority of the main characteristics of the title system is very reminiscent of that found recently in the pentathionate-iodate reaction, a system that led us to classify generally the clock reactions. Along with the pentathionate-iodate reaction the title system is proposed to belong to the autocatalysis-driven clock reactions as well. The kinetic model of the pentathionate-iodate system published recently was implemented by the necessary reactions of periodate to compose a 24-step kinetic model in which the mechanisms of the pentathionate-iodine, pentathionate-iodate, bisulfite-periodate, bisulfite-iodate, iodide-periodate, and the well-known Dushman reactions are combined. A thorough analysis revealed that the direct pentathionate-periodate reaction plays a role only to produce iodide ion via a finite sequence of reactions, and once its concentration reaches a certain level, the reaction is almost exclusively governed by the pentathionate-iodine, the iodide-periodate, and the Dushman reactions. As expected strong catalytic effect of the buffer composition is also found that can readily be explained by its well-known catalytic influence on the Dushman reaction.

Original languageEnglish
Pages (from-to)9811-9819
Number of pages9
JournalJournal of Physical Chemistry A
Volume118
Issue number42
DOIs
Publication statusPublished - Oct 23 2014

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autocatalysis
Iodates
clocks
Clocks
Kinetics
iodates
kinetics
Iodides
Iodine
Buffers
iodides
iodine
metaperiodate
buffers
Phosphates
Ions
Monitoring
phosphoric acid
Chemical analysis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Autocatalysis-driven clock reaction II : Kinetics of the pentathionate-periodate reaction. / Xu, Li; Horváth, A.

In: Journal of Physical Chemistry A, Vol. 118, No. 42, 23.10.2014, p. 9811-9819.

Research output: Contribution to journalArticle

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