Abstract
Since all the processes so far considered involve the transfer of a proton from one species to another, it is to be anticipated that the substitution of hydrogen by deuterium or tritium will affect both the rates and the equilibrium constants of these processes. There are in fact two reasons why isotope effects involving hydrogen will usually be much greater than those for any other elements. In the first place, the mass ratios m H : m D : m T = 1 : 2 : 3 differ greatly from unity, while the corresponding ratios for other common elements are nearly always between unity and 1.1. In the second place, the low mass of these nuclides in itself favours large isotope effects, since these are essentially quantum effects, depending upon deviations from classical mechanics, and such deviations are greatest, other factors being equal, for particles of small mass. This last point will be justified in more detail in the subsequent discussion.
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Bell, R.P. (1973). Isotope Effects in Proton-Transfer Equilibria. In: The Proton in Chemistry. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1592-7_11
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DOI: https://doi.org/10.1007/978-1-4757-1592-7_11
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