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Volume 10, 1975
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Hydrogen-bonded and ion-pair complexes in aprotic solvents

Abstract

The proton-transfer reactions between acids and bases in aprotic solvents of low relative permitivity lead to the production of ion-pair complexes via hydrogen-bonded reaction intermediates. For most systems the rate-limiting step is the formation of the hydrogen-bonded intermediate. The rate of these reactions, as measured by the temperature-jump technique, agree well with those calculated by a refined theory of diffusion-controlled rates which takes into account rotation within the encounter complex. The reactions of Bromophenol Blue with pyridine basis are anomalously slow, the rate-limiting step being proton-transfer within the hydrogen-bonded complex to form the ion-pair. Values of the enthalpy, entropy and volume of activation, and the primary kinetic isotope effect, enable the structure of the transition state to be deduced.

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Article type: Paper
DOI: 10.1039/FS9751000029
Citation: Faraday Symp. Chem. Soc., 1975,10, 29-40
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    Hydrogen-bonded and ion-pair complexes in aprotic solvents

    J. E. Crooks and B. H. Robinson, Faraday Symp. Chem. Soc., 1975, 10, 29
    DOI: 10.1039/FS9751000029

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