| abstract |
The invention relates to Fe, Ni, Co, Cr or Cu complexes of compounds which in the form of the free acids correspond to the general formula I <IMAGE> in which X is hydrogen, chlorine, bromine or hydroxysulphonyl, Y is chlorine, bromine, nitro, sulphamoyl or hydroxysulphonyl, Z<1> is hydrogen, methyl, methoxy, ethoxy, chlorine or bromine, Z<2> is hydrogen, chlorine or hydroxysulphonyl and n is 1 or 2. The compounds according to the invention are particularly suitable for the dyeing of leather. |