Browsing by Author "Tortschanoff, Karl"

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    Kinetics of the Reaction Between 2,4-Dinitrophenol and Tri-n-octylamine in Chlorobenzene Solution Diffusion and other Rate-limiting Factors
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (07), 1978) Caldin, Edward F.; Tortschanoff, Karl
    The kinetics of the reaction between 2,4-dinitrophenol and tri-n-octylamine in chlorobenzene solution have been investigated by a microwave temperature-jump technique. The rate constant is about 30 times smaller than the value calculated from the Smoluchowski treatment for a diffusion-controlled reaction. The activation enthalpy is slightly negative (ΔH[graphic omitted]=–6.7 ± 2 kJ mol–1 or –1.6 ± 0.5 kcal mol–1). This is strong evidence against a one-step mechanism. A three-step mechanism accommodates the results. For this mechanism the significant fact about ΔH[graphic omitted] is that it is lower than the viscosity-controlled value, rather than the fact that it is negative.