With metal ions chelatable or chelated monoazo dyestuffs, their use in image formation, a colour-photographic recording material with a releasable dye moiety, and a colour image with an image distribution of the nickel complexes of these dyestuffs

摘要

Azo dyes corresponding to the formula (I): IMAGE (I) wherein R1 represents a releasable group, R2 represents H, halogen or sulphonyl, R3 and R4 represent H or groups not capable of chelate formation, and Q represents a group for completing a phenyl or naphthyl group, combine with nickel ions to form stable azo dye-metal complexes which have advantageous spectral properties. They are therefore particularly suitable for the production of highly light-fast magenta images, e.g. by the ink jet process, in which they may be used directly in the form of colored inks, or by the dye diffusion transfer process, in which they are released imagewise from suitable dye-releasers in the course of development and transferred to a dye-receptive layer.