Abstract
Infra-red intensities at different temperatures were related to vapour-phase equilibrium conditions between monomers and dimers of acetic and of n-butyric acids. The van't Hoff equation was used to calculate the heats of dimerization which gave hydrogen-bond energies. The intensities of monomer and dimer bands in the carbonyl region (with a CaF 2 prism) and in the hydroxyl region (with a LiF prism) provided two independent measurements for each compound. The average values found for the hydrogen-bond energies were 8.5 ± 0.4 and 8.6 ± 0.4 kcal mole , respectively
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