Abstract (1) Absorption spectra of benzaldehyde-ethylenediimine, o-methoxybenzaldehyde-ethylenediimine, salicylaldehyde-ethylenediimine and o-hydroxyacetophenone-ethylenediimine have been measured, and the structures of the spectra have been qualitatively explained by the theories of absorption spectra of coordination compounds. (2) The longest-waved band of salicylaldehyde-ethylenediimine as well as of o-hydroxyacetophenone-ethylenediimine has been explained as due to intramolecular formation of a hydrogen bridge between the hydroxyl group and the nitrogen atom. In other words an absorption band of a hydrogen bond has been found in the near ultra-violet region. (3) The absorption spectrum of salicylaldehyde-ethylenediimine-cobalt has been explained and the steric configuration of the inner complex has thereby been corroborated.
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Tsuchida et al. (1938) studied this question.
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