The kinetic isotope effect on direct proton transfer from p-nitrophenol to imidazole in aqueous solution at 25 °C was found to be kH/kD= 2.8 ± 0.3, in good agreement with maximum isotope effects measured previously for proton transfer between normal acid–base centers in more complex systems.
Y. Chiang, A. J. Kresge and J. F. Holzwarth, J. Chem. Soc., Chem. Commun., 1982, 1203 DOI: 10.1039/C39820001203
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