Azoxy dyes and their copper complexes

The invention relates to azoxy dyes of general formula (I) in their free acid form, in which n is 0 or 1, R is methoxy, hydroxyl and carboxyl, R is carboxyl, amine, C1-C4 alkylamine, allylamine, benzylamine and methoxycarbonylmethylamine and the phenyl rings A can be substituted with C1-C8 alkyl, phenyl that can be substituted with methyl or halogen, hydroxyl, amine, nitro, halogen, carboxyl, N-benzylcarbamoyl, phenylcarbamoyl and naphthylcarbamoyl that can be unsubstituted or substituted with nitro, halogen, C1-C4 alkoxy, acetoxy, or they can be benzo-anellated. The invention also relates to their Cu complexes, to a method for producing the Cu complex dyes, to azoxy dyes of formula (I) in their partially or completely deacylated form, to their Cu complexes, to dyes containing said azoxy dyes and/or to their Cu complexes and to their use for dyeing and printing natural or synthetic substrates.