Harati Mohammad, Wang Jichang
Department of Chemistry and Biochemistry, University of Windsor, Ontario, N9B 3P4 Canada.
J Phys Chem A. 2008 May 8;112(18):4241-5. doi: 10.1021/jp710200y. Epub 2008 Mar 29.
Long time series of temporal oscillations and wave formation are observed in the catalyzed bromate-pyrocatechol reaction conducted in a batch reactor, in which the induction time is insensitive to the presence of ferroin but is greatly shortened by Ce(III) or Mn(II). On the other hand, the number of oscillations is significantly increased by ferroin, while it is less sensitive to Ce(III) and Mn(II). The ferroin-catalyzed system also exhibits strong photosensitivity, in which illumination could quench the oscillatory behavior. A phase diagram illustrates that the oscillatory behavior of the studied system is more sensitive to the ratio of [pyrocatechol]/[bromate] than their absolute concentrations. Reactions conducted in a spatially extended medium show that the ferroin-catalyzed system supports a two-stage pattern formation with the wave activity surviving for up to 10 h.
在间歇式反应器中进行的催化溴酸盐 - 邻苯二酚反应中，观察到了长时间的时间振荡序列和波的形成。其中，诱导时间对亚铁离子的存在不敏感，但Ce(III)或Mn(II)会使其大大缩短。另一方面，亚铁离子会显著增加振荡次数，而该反应对Ce(III)和Mn(II)不太敏感。亚铁离子催化体系还表现出很强的光敏性，光照会淬灭振荡行为。相图表明，所研究体系的振荡行为对[邻苯二酚]/[溴酸盐]的比例比对它们的绝对浓度更敏感。在空间扩展介质中进行的反应表明，亚铁离子催化体系支持两阶段的图案形成，波活动可持续长达10小时。
