Oxyhalogen−Sulfur Chemistry: Nonlinear Oxidation Kinetics of Hydroxymethanesulfinic Acid by Acidic Iodate
作者:Jonathan F. Ojo、Adenike Otoikhian、Rotimi Olojo、Reuben H. Simoyi
DOI:10.1021/jp037140q
日期:2004.4.1
The oxidation of hydroxymethanesulfinic acid, HMSA, by acidic iodate has been studied by spectrophotometric techniques. The reaction presents clock reaction characteristics in which in excess iodate conditions there is an initial quiescent period that is followed by a rapid production of iodine. The induction period before formation of iodine is inversely proportional to the iodate concentrations and
已经通过分光光度技术研究了酸性碘酸盐对羟基甲亚磺酸HMSA的氧化。该反应呈现时钟反应特征,其中在过量碘酸盐条件下有一个初始静止期,随后是碘的快速产生。碘形成前的诱导期与碘酸盐浓度和二级酸浓度成反比。碘离子通过减少诱导期的持续时间对反应速率有很强的催化作用。反应的化学计量取决于氧化剂与还原剂的比例。在过量 HMSA 条件下,化学计量推论为 3HOCH2SO2H + 2IO3- → 3HCHO + 3SO42- + 2I- + 6H+ 而在过量碘酸盐和长时间放置后,化学计量为 6IO3- + 5HOCH2SO2H → 5SO42- + 5HCOOH + 3I2 + 4H+ + 3H2O . 该机制由标准碘碘动力学主导,该动力学涉及反应性碘碘的初始形成...