Premium
Nonlinear Oxidation of Thiourea in an Unbuffered Medium
Author(s) -
DU YanRu,
WANG Shun,
LIN JuanJuan,
HUANG ShaoMing,
ZHOU Huan
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890320
Subject(s) - chemistry , thiourea , periodate , stoichiometry , briggs–rauscher reaction , aqueous solution , iodide , bistability , reaction mechanism , inorganic chemistry , catalysis , organic chemistry , physics , quantum mechanics
Abstract The reaction between periodate and thiourea has been studied in an unbuffered medium. A variety of interesting dynamical behavior including variable stoichiometries, characteristic "clock reaction" and oligooscillations or single peak oscillations in pH, the concentrations of both iodide and iodine were found in a closed reactor. When studied in an open reactor, the above reaction system displays fascinating damped oscillations and bistability in an unbuffered aqueous solution. A 12‐step simplified mechanism has also been proposed here. Our investigation illustrates that it is critical to include a rapid H + ‐mediated preequilibrium step in the suggested mechanism. The modified mechanism gives a better agreement between the calculated results and experimental observations.