高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (4): 706.

• 研究论文 • 上一篇    下一篇

碱性介质中分光光度法研究二羟基二(过碘酸根)合银(Ⅲ)氧化谷氨酸的反应动力学及机理

单金缓, 霍树营, 申世刚, 孙汉文, 王安周   

  1. 河北大学化学与环境科学学院, 河北省分析科学与技术重点实验室, 保定 071002
  • 收稿日期:2004-06-03 出版日期:2005-04-10 发布日期:2005-04-10
  • 通讯作者: 单金缓(1960年出生),女,硕士,教授,从事液相化学反应动力学研究.E-mail:shanjinhuaner@yahoo.com.cn E-mail:shanjinhuaner@yahoo.com.cn
  • 基金资助:

    河北省自然科学基金(批准号:295066)资助.

Kinetics and Mechanism of Oxidation of Glutamic Acid by Dihydroxydipriodatoargentate(Ⅲ) with Spectro-photometry in Alkaline Medium

SHAN Jin-Huan, HUO Shu-Ying, SHEN Shi-Gang, SUN Han-Wen, WANG An-Zhou   

  1. Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
  • Received:2004-06-03 Online:2005-04-10 Published:2005-04-10

PDF (PC)

被引次数

21

摘要： 在碱性介质中,用分光光度法研究了二羟基二(过碘酸根)合银(Ⅲ)(DPA)氧化谷氨酸(GA)的反应动力学及其机理.结果表明,反应对DPA为准一级,对GA为一级反应;在保持准一级条件([GA]0[DPA]0)下,表观速率常数随着[OH-]的增加先减小后增加,随着[IO4-]的增加而减小,且有正盐效应.据此提出了此反应的反应机理,由此反应机理推导出来的速率方程可很好地解释全部实验现象,进一步求得速控步骤速率常数k和298.2K时的平衡常数K及活化参数.

关键词: 二羟基二(过碘酸根)合银(Ⅲ), 谷氨酸, 氧化还原反应, 动力学及机理

Abstract: In recent years, the study of the highest oxidation state of transition metals has intrigued many researchers, which can provide new and valuable information in some fields. The kinetics of oxidation of glutamic acid by DPA in alkaline medium was studied with spectrophotometry in the temperature range of 250 ℃. The reaction was found to be pseudo-first order with respect to DPA and to be the first order to glutamic acid. At a low concentration of OH-, the reaction rate decreased with increasing the concentration of OH-, but when increased to an enough extent, the reaction rate increased with increasing the concentration of OH-. The rate decreased with increasing the concentration of IO4 and increased with the increase of μ and no free radical was detected. We bring forward the mechanism of the reaction, which can be used to explain all the experimental results. The activation parameters of the rate-determining step and the equilibrium constant were calculated at 298.2 K.

Key words: Dihydroxydipriodatoargentate(Ⅲ), Glutamic acid, Redox reaction, Kinetics and mechanism

中图分类号: 

TrendMD: