Solvent Effect on the Enthalpy and Entropy of Activation for the Hydrolysis of Ethyl Cinnamate in Mixed Solvent System

S. Ak
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引用次数: 2

Abstract

The rate of alkaline hydrolysis of ethyl cinnamate was measured over the temperature range of 20°C to 40°C in water-acetone mixture at different composition 30 to 70% (v/v). The influence of solvent variation on reaction rate was examined in term of changes in the Activation parameter. Depletion of ?H* and ?S* value with simultaneous increase in ?G* of the reaction in reaction media, reveals that the reaction is Enthalpy domination and Entropy controlled. The Iso- dielectric activation energy (ED) of reaction was found to decrease from 52.43 to 47.28. The Values of Iso-kinetic Temperature which is less than 300, clearly indicates that there is no appreciable interaction between solvent and solute present in the reaction media, i.e., reaction is not ion-dipole but ion-molecule type.
混合溶剂体系中溶剂对肉桂酸乙酯水解焓和活化熵的影响
在温度为30 ~ 70% (v/v)的水-丙酮混合物中,测定了肉桂酸乙酯在20 ~ 40℃范围内的碱性水解率。通过活化参数的变化考察了溶剂的变化对反应速率的影响。反应介质中H*和S*值的耗竭与G*值的增加同时发生,说明该反应为焓占主导、熵控制的反应。反应的等介电活化能(ED)由52.43降低到47.28。等动力学温度小于300,表明反应介质中溶剂与溶质之间没有明显的相互作用,即反应不是离子偶极子型,而是离子分子型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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