Thiopheneazo dyes with a coupling component of the diaminopyridine series

A process for dyeing and printing textile materials with azo dyes, which comprises applying thereto an azo dye of the formula Ia ##STR39## where X is cyano or a radical of the formula COOQ.sup.1 or CONQ.sup.1 Q.sup.2, wherein Q.sup.1 and Q.sup.2 are identical or different and singly are, independently of one another, substituted or unsubstituted C.sup.1 -C.sup.12 -alkyl with or without interruption by from 1 to 3 oxygen atoms in ether function, C.sub.5 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.4 -alkenyl, or substituted or unsubstituted phenyl, or together are, together with the nitrogen atom joining them, a 5- or 6-membered saturated heterocyclic radical with or without further hetero atoms or else Q.sup.2 may be hydrogen,

• Y is C.sub.1 -C.sub.6 -alkylthio, C.sub.1 -C.sub.6 -alkylsulfonyl, halogen, substituted or unsubstituted phenoxy, substituted or unsubstituted phenylthio or substituted phenylsulfonyl, with the proviso that Y is not --Br,
• Z is cyano, nitro, substituted or unsubstituted phenylsulfonyl, C.sub.1 -C.sub.6 -alkylsulfonyl, formyl or a radical of the formula --CH.dbd.T, wherein T is the radical of an acidic-CH compound, and
• A.sup.1, A.sup.2 and A.sup.3 are identical or different and singly are, independently of one another, substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl, with or without interruption by from 1 to 3 oxygen atoms in ether function, C.sub.5 -C.sub.7 -cycloalkyl, substituted or unsubstituted phenyl, C.sub.3 -C.sub.6 -alkenyl, substituted or unsubstituted benzoyl, C.sub.1 -C.sub.8 -alkanoyl, C.sub.1 -C.sub.8 -alkylsulfonyl or substituted or unsubstituted phenylsulfonyl, or A.sup.2 and A.sup.3 together are, together with the nitrogen atom joining them, a 5- or 6-membered saturated heterocyclic radical with or without further hetero atoms.