Abstract
The infrared continua caused with intramolecular hydrogen bonds of the type AH⋯B ⇌ A–⋯H+B have been studied as a function of the ΔpKa of the hydrogen-bond donor and acceptor as well as a function of the temperature. From the behaviour of these continua it is shown that the shape of the proton potential may change with decreasing temperature from a double minimum with the deeper well at the donor to proton potential with the deeper well at the acceptor. The In (KPT) over 1/T plots result, however, always in negative apparent ‘ΔH° values’. Hence with all such proton-transfer hydrogen bonds the deeper well of the double-minimum proton potentials should always be at the acceptor group.
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