| 二(碲酸根)合铜(Ⅲ)酸根氧化乙二醇独甲醚的动力学及机理 |
| Kinetics and Mechanism of Oxidation of Ethylene Glycol Monomethyl Ether by Ditelluratocuprate(Ⅲ) in Alkaline Medium |
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| 摘要: 在23～39℃区间内用分光光度法在碱性介质中研究了二(碲酸根)合铜(Ⅲ)酸根离子氧化乙二醇独甲醚的动力学及机理。实验结果表明反应对二(碲酸根)合铜(Ⅲ)酸根离子是准一级,对乙二醇独甲醚是分数级。准一级速率常数kobs随[TeO42-]的增大而减小,随[OH-]在一定范围内的增加kobs增加,[OH-]继续增加kobs趋于常数,且发现有负盐效应。根据实验结 |
| 关键词: 二(碲酸根)合铜(Ⅲ)酸根离子 乙二醇独甲醚 氧化还原 动力学及机理 |
| 基金项目: 河北省自然科学基金(No.295065) |
| Abstract: The kinetics of oxidation of ethylene glycol monomethyl ether by ditelluratocuprate(Ⅲ) has been studied by spectrophotometry in alkaline medium. The reaction rate showed pseudo first order dependence in oxidant and 0.85～ 0.90 order in ethylene glycol monomethyl ether. It was found that the pseudo first order ([EGM]>>[DTC]) rate constants, kobs increased with the increase in [OH-]([OH-]=1.68× 10-2mol· L-1～3.86× 10-2 mol·L-1 ) and decrease in [TeO42-],when [OH-] continue increasing kobs kept being constant .There is a negative salt effect. Amechanism involving a preequilibrium of a adduct formation between the complex and ehtylene glycol monomethyl ether was proposed. The equation derived from the mechanism can explained all the experimental results. The activation parameters along with the rate constants of the rate determing step were calculated. |
| Keywords: ditelluratocuprate(Ⅲ) ethylene glycol monomethyl ether redox reaction kinetics and mechanism |
| 投稿时间：2000-03-09 修订日期：2000-08-11 |
| 摘要点击次数: 1799 |
| 全文下载次数: 1943 |
| 单金缓,王莉,申世刚,孙汉文,刘保生.二(碲酸根)合铜(Ⅲ)酸根氧化乙二醇独甲醚的动力学及机理[J].无机化学学报,2000,16(6):888-892. |
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