Activation parameters of bromoacetate-thiosulfate reaction in ethylene glycol-water mixtures.

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概要

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• The activation parameters for the reaction between bromoacetate (\barR) and S<SUB>2</SUB>O<SUB>3</SUB><SUP>2−</SUP> ions in water and aqueous mixtures of ethylene glycol (5–50% by weight) have been evaluated from the rate constants, corresponding to zero ionic strength, at 15, 25, and 35 °C. The standard free energies of transfer (Δ<I>G</I><SUB>tr</SUB>°) of the reacting ions and hence of the transition state (Δ<I>G</I><SUB>tr</SUB><SUP>#</SUP>) from water to the mixed media at 25 °C have been determined from the measured solubilities of AgR, TlCl, and Tl<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB> in the different media, using the reported values of Δ<I>G</I><SUB>tr</SUB>° of Ag<SUP>+</SUP> and Cl<SUP>−</SUP> ions. Attempts have been made to interpret the kinetic results in the light of solvent properties and free energies of transfer. Although both the reacting ions are destabilized, on adding glycol to the medium, the larger destabilization of the transition state, arising from decreased dielectric constant as well as solvating capacity of the medium, outweighs the combined effects on the reactants leading to reduced reaction rates.

• 公益社団法人 日本化学会の論文

著者

• Das Mihir

  Department of Chemistry, Jadavpur University

• Biswas Prasanta

  Department of Chemistry, Jadavpur University

• Maula Anwarul

  Department of Chemistry, Jadavpur University

関連論文

• Thermal investigation of nickel(II) diamine complexes in solid state.
• Thermal studies of nickel(II) hydrazine complexes in solid state.
• Activation parameters of bromoacetate-thiosulfate reaction in ethylene glycol-water mixtures.

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