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The "N, I3C and 'H NMR spectra of 2:l cobalt(II1) complexes of azo dyes and tbei "N isotopomers, derived from substituted Zhydroxyaniline azo coupling products with acetoacetanilide, were measured. It was found that, in contrast to precursors existing fully in their hydrazone forms, 2:l cobalt(II1) complexes exist in (E)-azo contigurations, cobalt being bound to oxygens which originate in bydroxy and amide groups and nitrogen from substituted anilines as starting material.

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