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Some possible applications of infra-red spectroscopy in the anthraquinone field have been examined. In most cases the compounds were examined as solids, on account of their limited solubility and the possibility of molecular rearrangements in solution. Although complete interpretations of the spectra are not possible, information has been gained about the finer details of the structures of various quinones of known constitution, from measurements of the frequencies of bands associated with carbonyl, hydroxyl, amino-, and other groups. The hydrogen bonding in hydroxyquinones has been examined. An interesting resonance phenomena is observed in aminoanthraquinone derivatives. The spectra of certain benzamido-and acetamido-quinones in the solid state show anomalies. The use of infra-red spectroscopy in identifying reduction products of unknown constitution has been assessed, by examining various authentic anthrones, oxanthrones, etc.Leucoquinizarin and the stable leucocompound of 1 : 4-diaminoanthraquinone have been examined.This application shows promise.

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