物理化学学报 >> 1994, Vol. 10 >> Issue (12): 1110-1115.doi: 10.3866/PKU.WHXB19941211

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二过碘酸合铜(III)氧化氨基丙酸的动力学

单金缓, 刘铁英, 王安周   

  1. 河北大学化学系，保定 071002
  • 收稿日期:1993-10-04 修回日期:1994-01-05 发布日期:1994-12-15
  • 通讯作者: 单金缓

Kinetics and Mechanism of Oxidation of α-alanine Bydiperiodatocuprate(III) in Alkaline Medium

Shan Jin-Huan, Liu Yie-Ying, Wang An-Zhou   

  1. Department of Chemistry,Hefei University,Baoding 071002
  • Received:1993-10-04 Revised:1994-01-05 Published:1994-12-15
  • Contact: Shan Jin-Huan

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关键词: 二过碘酸合铜(III)配离子, 氧化还原反应, 氨基丙酸, 动力学和机理

Abstract:

The kineties and mechanism of oxidation of α-alanine by diperiodatocuprate (Ⅲ) ion was studied by spectrophotometry in alkaline medium. The reaction rate showed first order dependance in oxidant and 1.25 order dependance in α-alanine. It was found that the pesudo first-order ([Ala].>> [Cu(Ⅲ)].) rate constant kobs increases with the increases in [OH] and decreases with the increases in [IO]. The linear relationships between [Ala/kobs and 1/[Ala] and between 1/kobs and [IO] were observed in our experiment. There is a positive salt effect. Under the protection of nitrogen gas, the reaction system can induce polyn1erzation of acrylamide. A plausible mechanism involving free redicals has been proposed. The rate equations derived from the mechanism explained all the experimental results satisfactorily. The rate constant activation parameters of rate determing step have been calculated.

Key words: Diperiodato cuprate(III), α-Alanine, Redox reaction, Kinetics and mechanism