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金属离子对没食子酸(GA)-BZ非催化振荡反应的影响

EFFECTS OF METALLIC IONS ON THE UNCATALYZED OSCILLATIONS IN CALLIC ACID(GA)BZ SYSTEM

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【作者】 王明辉李和兴

【Author】 Wang MinghuiLi Hexing* (Depantment of Chemistry ,Shanghai Normal University ,Shangai 200234)

【机构】 上海师范大学化学系

【摘要】 测定了一系列金属离子对没食子酸(GA)-KBrO3-H2SO4体系非催化振荡反应的影响。从实验中发现,金属离子对上述振荡反应的影响可分为三类:(1)Ce3+、Mn2+、Fe(phen)2+3、Bi3+和Cr3+,可促进GA-BZ体系的非催化振荡反应,同时可产生连续振荡等复杂振荡现象;(2)Cu2+、Zn2+、L3+a、Sm3+、Eu3+、Ni2+、Co2+、Hg2+、Ag+和Hg2+2对振荡反应具有强烈的抑制作用;(3)碱金属和碱土金属离子对振荡反应几乎不发生影响。对上述金属离子的影响机理进行了探索,说明金属离子的电极电势、金属离子与GA形成络合物或与Br-形成沉淀是影响上述振荡反应的主要原因,而金属离子与有机物中间体的偶合催化导致产生连续振荡反应

【Abstract】 The effects of various metallic ions in the uncatalyzed oscillations in gallic acid (GA)-BrO-3-H2SO4 system have been determined.The experimental results showed that their effects could be classified into following three groups:(1) Adding Ce3+,Mn2+,Fe(phen)2+3,Bi3+and Cr3+ promoted the oscillations.The dualfrequency oscillations was also observed in the presence of Ce3+,Fe(phen)2+3;(2)Adding Cu2+,Zn2+,La3+,Sm3+,Eu2+,Ni2+,Co2+,Hg2+,Ag+ and Hg2+2 strongly inhibited the present oscillations;(3)Adding alkline or earthalkline metallic ions had no significant effects.The effecting mechanism of those metallic ions on the oscillations was discussed on the basis of standard potential of the metallic ion electrode couples,with the tentative conclusion that the coordination between the metallic ions and the GA,and the reactions between the metallic ions and Br- may form precipitate.The dualfrequency oscillations observed in the present systems were possibly ascribed to the coupledcatalysis between the organi

【基金】 上海市科委“启明星”计划资助项目
  • 【文献出处】 化学研究与应用 ,CHEMICAL RESEARCH AND APPLICATION , 编辑部邮箱 ,1999年03期
  • 【分类号】O643.1
  • 【被引频次】13
  • 【下载频次】180
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