Abstract
AbstractEnthalpies of hydrogen bond formation between phenol and substituted pyridines are measured by calorimetry. The obtained energies are compared with the base ionization constants in water and the σ values of the pyridine substituents. The relation formation energy to infrared frequency shift is the same as for alcohols or phenols‐pyridine complexes. Distances between O and N atoms linked by the hydrogen bond are related to the infrared frequency shift: it is then concluded that a linear relation exists, for the complexes studied, between the heat of formation and the bond distance. Influence of steric hindrance on the bond distance is discussed.
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