碱性介质中二过碘酸合铜(Ⅲ)配离子氧化2-氨基-1-丁醇的反应动力学及机理  

Kinetics and Mechanism of Oxidation of 2-Amino-1-butanol by Diperiodatocuprate(Ⅲ) in Alkaline Medium

作　　者：单金缓[1] 韩冲[1] 霍树营[1] 范立[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2008年第1期46-51,共6页Journal of Hebei University(Natural Science Edition)

摘　　要：采用分光光度法在298．2～313．2K内研究了碱性介质中二过碘酸合铜（Ⅲ）酸根配离子（DPC）氧化2-氨基-1-丁醇（AB）的反应动力学及机理．结果表明，反应对氧化剂（DPC）是一级，对还原剂AB的表观反应级数（nap）：1〈nap〈2，准一级速率常数kobs在弱碱性介质中随[OH^-]增大而减小，在较强碱性介质中随[OH^-]增大而增大，随[IO^-4]ex（ex表示外加的IO^-4的离子浓度）的增大而减小，也随离子强度的增大而减小，并且有弱的负盐效应．据此导出了一个能够解释全部实验事实的速率方程，求出了速控步骤的速率常数及298．2K时的活化参数．The kinetics of oxidation of 2-Amino-1-Butanol（AB） by diperiodatocuprater（Ⅲ） （DPC） in aqueous alkaline medium has been studied by spectrophotometry in a temperature range of 298.2-313.2 K. The reaction was found to be pseudo-first order（kobs） with respect to DPC and 1 〈 nap〈 2 to AB. It was found that under the condition of the pseudo-first order （[AB]0〉〉 [DPC]0）, the observed rate constant kobs changed differently under different [OH^-1]： at low [OH^-1], kobs decreased with increase in [OH^-], but when [OH^-] increased to enough extent, kobs increased with increase in [OH^-], and then it decreased with increase in [IO^-4]. There is a weak negative salt effect. Based on the experimental results, a probable reaction mechanism of oxidation is proposed. The rate equation derived from the mechanism can explain all the experimental phenomena. The activation parameters along with the rate constants of the rate-determining step were calculated.

关 键 词：二过碘酸合铜(Ⅲ) 2-氨基-1-丁醇 氧化还原反应 动力学及机理 

分 类 号：O643.12[理学—物理化学]