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Kinetic Evidence of Tautomerism of Thiourea Dioxide in Aqueous Acidic Solutions
Author(s) -
Csekő György,
Hu Ying,
Song Yanan,
Kégl Tímea R.,
Gao Qingyu,
Makarov Sergei V.,
Horváth Attila K.
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201400059
Subject(s) - chemistry , chlorine dioxide , thiourea , carbon dioxide , reactivity (psychology) , autocatalysis , aqueous solution , inorganic chemistry , tautomer , photochemistry , organic chemistry , catalysis , medicine , alternative medicine , pathology
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.