Provisional Recommendations are drafts of IUPAC recommendations on terminology, nomenclature, and symbols made widely available to allow interested parties to comment before the recommendations are finally revised and published in Pure and Applied Chemistry. Full text is available online. Definition of the Hydrogen Bond This recommendation provides a short definition for the hydrogen bond, followed by a list of experimental and/or theoretical criteria, which can be used as evidence for the

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... nce of the hydrogen bond. Finally, some characteristics that are typical of hydrogen bonded systems are given. A brief explanation of the terms used is provided after the definition. The task group has also produced a comprehensive technical report, which provides a summary of the past work on hydrogen bonding and also the rationale for the proposed definition.