动力学研究 2-氯乙基膦酸在水溶液中的热分解。
Kinetic studies of the thermal decomposition of 2-chloroethylphosphonic Acid in aqueous solution.
机构信息
Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6.
出版信息
Plant Physiol. 1976 Nov;58(5):700-2. doi: 10.1104/pp.58.5.700.
Abstract
The decomposition of 2-chloroethylphosphonic acid in aqueous solution has been studied at pH values from 6 to 9 and at temperatures in the 30 to 55 C range. The rate of decomposition is estimated from the rate of formation of ethylene. The rate is proportional to the concentration of the phosphonate dianion and is independent of the hydroxyl ion concentration. The rate constant at 40 C is 1.9 x 10(-4) sec(-1) and the activation energy is 29.8 kcal mol(-1). The rate of reaction is not affected significantly by the presence of potassium iodide or urea (substances which increase the rate of leaf abscission in trees sprayed by 2-chloroethylphosphonic acid). The rate decreases slightly in the presence of low concentrations of magnesium and calcium ions.
摘要
已经研究了 2-氯乙基膦酸在 pH 值为 6 至 9 且温度在 30 至 55°C 范围内的水溶液中的分解。通过乙烯的形成速率来估计分解速率。该速率与膦酸二阴离子的浓度成正比，并且与氢氧根离子浓度无关。在 40°C 时的速率常数为 1.9×10(-4) sec(-1)，活化能为 29.8 kcal mol(-1)。反应速率不受碘化钾或尿素（可增加经 2-氯乙基膦酸喷雾处理的树木中叶片脱落速率的物质）的存在显著影响。在存在低浓度的镁和钙离子时，反应速率略有下降。
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