Kinetic evidence of tautomerism of thiourea dioxide in aqueous acidic solutions

György Csek, Ying Hu, Yanan Song, Tímea R. Kégl, Qingyu Gao, Sergei V. Makarov, Attila K. Horváth

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10 Citations (Scopus)


Indirect experimental evidence of the existence of a sluggish tautomerism of thiourea dioxide in acidic aqueous solution was discovered while studying its oxidation by chlorine dioxide. Thiourea dioxide slowly rearranges into aminoiminomethanesulfinic acid, but the reactivity of these two species towards chlorine dioxide marginally differs. It was clearly demonstrated that thiourea dioxide reacts with chlorine dioxide in a relatively slow reaction in an autocatalytic fashion with respect to the carbon(IV) species. In contrast, reaction of aminoiminomethanesulfinic acid with chlorine dioxide is orders of magnitude faster but proceeds through a normal second-order process.

Original languageEnglish
Pages (from-to)1875-1879
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number11
Publication statusPublished - Apr 2014



  • Autocatalysis
  • Kinetics
  • Reactivity
  • Sulfur
  • Tautomerism

ASJC Scopus subject areas

  • Inorganic Chemistry

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