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在碱性介质中于 2 5～ 40℃用分光光度法研究了二过碲酸合铜 (Ⅲ )配离子 (DTC)氧化羟基乙酸钠 (SG)的反应动力学及机理。结果表明 ,反应对Cu(III)为一级 ,对SG为正分数级 ;准一级速率常数 (kobs)随着OH- 浓度的增加而增大 ,随着TeO2 -4 浓度的增加而减小 ;有负的盐效应。据此提出了包括配离子和SG形成络合物的前期快速平衡的反应机理 ,由假设反应机理推出的速率方程能解释全部实验现象 ,进一步求得速控步的速率常数和活化参数
The kinetics and mechanism of the oxidation of sodium glycolate (SG) by di-perchlorate copper (Ⅲ) complex ion (DTC) was studied spectrophotometrically at 25 ℃ ~ 40 ℃ in alkaline medium. The results show that the reaction is first order for Cu (III) and positive fraction for SG; kobs increase with increasing OH- concentration and decrease with increasing TeO2-4 concentration ; Negative salt effect. Based on this, the reaction mechanism of early rapid equilibrium including complex ions and SG formation was proposed. All the experimental phenomena can be explained by the rate equation derived from the hypothesized reaction mechanism, and the rate constants and activation parameters