高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (1): 95.

• 研究论文 • 上一篇    下一篇

分光光度法研究二羟基二(过碘酸根)合镍(Ⅳ)氧化丁二醇的反应动力学及机理

单金缓1, 钱璟1, 王孟歌2, 申世刚1, 孙汉文1, 王安周1   

  1. 1. 河北大学化学与环境科学学院, 保定 071002;
    2. 保定师范专科学校化学系, 保定 071051
  • 收稿日期:2003-01-29 出版日期:2004-01-24 发布日期:2004-01-24
  • 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:qianjinger@yahoo.com.cn E-mail:qianjinger@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 Butylene-glycol by Dihydroxy- diperiodatonickelate(Ⅳ) with Spectrophotometry in Alkaline Media

SHAN Jin-Huan1, QIAN Jing1, WANG Meng-Ge2, SHEN Shi-Gang1, SUN Han-Wen1, WANG An-Zhou1   

  1. 1. College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;
    2. Department of Chemistry, Baoding Teachers′ College, Baoding 071051, China
  • Received:2003-01-29 Online:2004-01-24 Published:2004-01-24

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)合镍()(DPN)氧化β,γ-丁二醇(β,γ-BG)的反应动力学及机理.结果表明,反应对DPN为准一级,对BG为正分数级;在保持准一级条件([BG]0[DPN]0)下,表观速率常数随着[OH-]的增加而增大,随着[IO4-]的增加而减小,无明显的盐效应.据此提出了包括BG和二羟基一(过碘酸根)合镍(Ⅳ)(MPN)形成加合物的前期平衡的反应机理,用假设反应机理推出的速率方程可解释全部实验现象,进一步求得速控步骤的活化参数.

关键词: 二羟基二(过碘酸根)合镍(Ⅳ), &beta, -丁二醇, &gamma, -丁二醇, 氧化还原反应, 动力学及机理

Abstract: The kinetics of oxidation of β-butylene-glycol(β-BG) and γ-butylene-glycol(γ-BG) by DPN in alkaline medium was studied with spectrophotometry in a temperature range of 25—40 ℃.The reaction was found to be pseudo-first order with respect to DPN and to be fractional order to β-BG and γ-BG. The rate increased with the increase of [OH-] and decreased with the increase of [IO4-]. Adding salts did not affect the rate and no free radical was detected. A mechanism involving a pre-equilibrium of an adduct formation between MPN and BG was proposed. The activation parameters of the rate-determining step were calculated.

Key words: Dihydroxydiperiodatonickelate(Ⅳ), β-Butylene-glycol, γ-Butylene-glycol, Redox reaction, Kinetics and mechanism

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