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Chem. Commun., 2010, 46, 481 - 483, DOI: 10.1039/b917765e

Are there single-well hydrogen bonds in pyridine–dichloroacetic acid complexes?

Charles L. Perrin and Phaneendrasai Karri

The 18O-induced isotope shifts in 13C NMR spectra of 1:1 complexes of Cl2CHC18O2H with a series of substituted pyridines in CD2Cl2 at low temperature reach a maximum when the acidities of the hydrogen-bond donors are matched, consistent with a mixture of tautomers, and with no drop that would indicate a single-well H-bond.

Graphical abstract image for this article (ID: b917765e)