Iron complexed dyes based on 1,5-diaryl-3cyanoformazanes

In the search for more environmental friendly dyes, the synthesis of new 1:2 iron complexes of 1,5-diaryl-3-cyanoformazanes was carried out. The structure and colouristic properties of 16 new dyes and their intermediates was characterised by 1H NMR, FAB and UV¯VIS spectroscopy. The products were used as acid dyes in the coloration of wool and polyamide fibres. Application, colouristic and fastness properties of the dyes were determined and discussed.