BZ类双催化及非催化化学振荡反应

COUPLE CATALYZED AND UNCATALYZED B-Z TYPE OSCILLATING REACTION

本文报道以香草醛(以OA表示)为底物的双催化振荡反应以及以2,7-二羟基萘二酚(以DN表示)为有机底物的非催化振荡反应,对二类不同体系的振荡反应机理作了初步的探索。实验部分1.试剂和仪器实验中的反应物均采用分析纯,所有溶液均在去离子水中制备,测定时主要采用PXS-215型离子活度计,XWT-台式自动平衡记录仪。2.实验方法使用超级恒温槽,控制在所需温度下进行反应,以溴离子选择性电极测量并记录反应过程中电位随时间的变化来反映[Br^-]的变化,以Hg|Hg_2SO_4|K_2SO_4为参比电极,振荡现象也可以用HP8451紫外可见分光光度计测定特定波长的吸光率变化进行观察。

In this paper, two different kinds of B-Z type oscillating reactions have beendescribed. One is the couple catalyzed oscillating reaction with vanillin(OA)as the organic substrate. Another is the uncatalyzed oscillating reaction with 2,7-dihydroxynaphthalene (DN) as the organic substrate. Effects of many factors on theoscillations have been examined. According to the FKN mechanism, a simple modelfor the catalyzed oscillation has been proposed. Each of experimental results can beexplained with this model. It is found thad the model can also be employed in theuncatalyzed oscillating reaction supposing that the organic substrate DN can play therole of catalyst as the metal ion in the catalyzed oscillating reaction.