Abstract
In crystals with hydrogen bonds infrared continua are sometimes observed. They demonstrate that in crystals hydrogen bonds may show large proton polarizability. Heteroconjugated OH⋯N⇌−O⋯H+N bonds present in phenol+amine crystals as well as long, weak N+H⋯N⇌N⋯H+N bonds are discussed. Furthermore, results with short, strong −O⋯H+⋯−O bonds formed in carboxylic acid–carboyxlate crystals are considered. It is shown that in crystals a continuum of energy levels arises due to the interaction of the polarizable hydrogen bonds via proton dispersion forces. The nature of these forces is explained; they are attractive forces.
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