1:2 chromium and cobalt complexes of monoazo compounds for drying porous oxide layers on aluminum and aluminum alloy substrates

摘要

1:2 metal complexes of the formula ##STR1## wherein each of R. sub.1 and R.sub.3 is independently hydrogen or nitro, with the proviso that when a ring has two nitro groups, they are meta to each other, P Peach of R.sub.2 and R.sub.4 is independently hydrogen, chloro or --SO.sub.3 M,PPeach of R.sub.5 and R.sub.6 is independently hydrogen, --COR.sub.7, --CONHR.sub.8 or --SO.sub.2 R.sub.9, PPwhereinPPR.sub.7 is C.sub.1-6 alkyl, C. sub.1-6 alkoxy, phenyl(C.sub.1-4 -alkyl) or phenyl (C.sub.1-4 alkyl) the phenyl group of which is substituted by 1 or 2 substituents selected from halo, C.sub.1-4 -alkyl, C.sub.1-4 alkoxy, nitro, amino, --COOM, --SO.sub. 3 M and acetamido,PPR.sub.8 is hydrogen; C.sub.1-6 alkyl; phenyl; phenyl substituted by 1 or 2 substituents selected from halo, C. sub.1-4 alkyl, C.sub.1-4 alkoxy, nitro, amino, --COOM, --SO.sub.3 M and acetamido; naphthyl or naphthyl monosubstituted by chloro, amino, phenylamino, acetamido, benzamido or --SO.sub.3 M, andPPR. sub.9 is C.sub.1-6 alkyl, phenyl or phenyl substituted by 1 or 2 substituents selected from halo, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, nitro, amino, --COOM, --SO.sub.3 M and acetamido, andPPMe is chromium or cobalt, wherein each M and M.sup.⊕ is independently hydrogen or a non-chromophoric cation,PPwith the provisos that (1) when both R.sub.5 and R.sub.6 are hydrogen, both R.sub.1 and R. sub.3 are hydrogen and at least one of R.sub.2 and R.sub.4 is chloro, and (2) the --NHR.sub.5 group is in the 2- or 3-position of Ring A and the -- NHR.sub.6 group is in the 2- or 3-position of Ring B, and mixtures thereof, are useful as dyes for dyeing or printing various materials, such as natural and synthetic polyamides and particularly for dyeing artificially produced oxide layers on aluminum or aluminum alloys.