Dithioalkylpyrrolopyrroles and the use thereof as dyes

A dithiopyrrolopyrrole compound of formula (1)

• in which
• R1, R2, R3 and R4, independently of one another, stand for linear or branched, optionally halogen-substituted alkyl groups having 1 to 20 carbon atoms or halogen;
• Q1 and Q2 each denote single bonds or stand, independently of one another, for O, OCF2, CF2, CF2CF2 or CO;
• A1, A2, A3 and A4 each denote single bonds or stand, independently of one another, for a group formed by phenylene, pyridine, pyrimidine, pyridazine, naphthylene, thiophene, selenophene and thiazole,
• with the proviso that
• (i) at least A3 and A4 must represent aromatic ring structures and
• (ii) the aromatic ring structures are optionally substituted by halide;
• and
• Z1, Z2, Z3, Z4, Z5 and Z6 each denote single bonds or stand, independently of one another, for a radical selected from the group formed by C≡C CH═CH, CF═CF, CF═CH, CH2CH2, CF2—CF2 and CF2O, with the proviso that
• (iii) at least Z3 and Z4 represent either single bonds or a π-conjugated group.