Measurement of the isotope effect, Δ, on an n.m.r. chemical shift, as a function of the extent of ionisation, is the basis of a very sensitive method illustrated with formic acid for measuring isotope effects on mobile acid–base equilibria.
S. L. R. Ellison and M. J. T. Robinson, J. Chem. Soc., Chem. Commun., 1983, 745 DOI: 10.1039/C39830000745
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