Importance

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Abstract

Compounds of the formula ##STR1## wherein each R is independently --N(R.sub.1).sub.2, --N.sup..sym. (R.sub.2).sub.3 A.sup..crclbar. or hydroxy, wherein each R.sub.1 is independently hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl or aryl or both R.sub.1 's taken together and with the nitrogen atom to which they are attached form a 5- or 6-membered saturated heterocyclic ring, each R.sub.2 is independently alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl or aryl or two R.sub.2 's taken together and with the nitrogen atom to which they are attached form a 5- or 6-membered saturated heterocyclic ring or all three R.sub.2 's taken together and with the nitrogen atom to which they are attached form a 5- or 6-membered unsaturated heterocyclic ring, and A.sup..crclbar. is a non-chromophoric anion, each T is independently a bridging radical, and Z is hydrogen or --N.dbd.N--D, wherein D is a diazo component radical, are dyes useful for the dyeing of for example, paper, leather, cellulosic materials such as cotton and textiles comprising polyacrylonitrile or polyamides or polyesters modified to contain anionic groups. Polymeric compounds containing at least two units each of which contains residues of two compounds of said formula, which may be the same or different, joined by biscationic bridging radicals are also useful as dyes for the same materials.

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