NiL(ClO_4)_2催化NaBrO_3-MA-H_3PO_4体系振荡反应的研究

Oscillating Reactions of NaBrO3-MA-H3PO4 System Catalyzed by Tetraazamacrocyclic Nickel(Ⅱ) Complex

报道了一种反式Curtis环的镍 (Ⅱ)的配合物NiL(ClO4 ) 2 (L为 2 ,4 ,4 ,9,11,11-六甲基 -1,5,8,12 -四氮杂环十四 - 1,5,8,12 -四烯 )催化NaBrO3 -CH2 (COOH) 2 (MA) -H3 PO4 体系的化学振荡反应。测得该体系的振荡范围 ,研究、分析了各物种浓度、自由基抑制剂和还原剂、Ag+ 、Hg2 + 以及温度对振荡反应的影响。结果表明Br- 起重要动力学控制作用 ,在反应过程中有自由基、Br2 产生并参与了反应。同时发现搅拌速度对反应有很大影响。

New oscillating reactions catalyzed by a tetraazamacrocyclic nickel(Ⅱ) complex NiL(ClO 4) 2, where L is 2,4,4,9,11,11-hexamethyl-1,5,8,12-tetraazabutadecacyclo-1,5,8,12-tetraene, in acidic bromate medium have been studied. The concentration ranges of main reactant within which the oscillations were observed in the system were obtained. The influences of temperature, Vc ,Br -, Ag + , Hg 2+ , acetonitrile or acrylamide on the oscillations were discussed. The results indicated that Br - played an important role in the control reaction progress and free radicals, Br 2 might be involved in the reaction process. It was found that the stirring rate can affect oscillating reactions. The oscillation trajectories of this system were recorded. They were different from classical BZ reaction and some other tetraazamacrocyclic complexes catalyzed systems.