Disulfide dyes

Compounds of formula

• A-(X1)p—(Csat)r—S—S—(Csat)q—(X2)p-D (1)
• or formula
• wherein
• A is a radical of formula (1a) W—N═N—Ar—;
• (1b) Ar—N═N—W—;
• or (1c) Ar—N(R4)—N═CH—W—
• wherein W is a radical of a cationic aromatic substituted or unsubstituted heterocyclic compound of formulae
• Z1,Z2,Z3,Z4 and Z5, independently from each other N or —CH═;
• R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19 and R29 independently from each other are hydrogen;
• halogen;
• or C1-C14alkyl, which is saturated or unsaturated, linear or branched, substituted or unsubstituted, or interrupted or uninterrupted with heteroatoms;
• a radical of phenyl, which substituted or unsubstituted;
• a of carboxylic acid radical;
• sulfonic acid radical;
• hydroxy;
• nitrile;
• C1-C16alkoxy, (poly)-hydroxy-C2-C4-alkoxy;
• halogen;
• sulfonylamino;
• SR20, NHR21;
• NR22R23;
• OR24;
• SO2;
• COOR25;
• NR26COR27;
• or CONR28;
• and R20, R21, R22, R23, R24, R25, R26, R27 and R28 are each independently of the other hydrogen;
• unsubstituted or substituted C1-C14alkyl, C2-C14alkenyl, C5-C10aryl- C5-C10aryl-(C1-C10alkyl), or —C1-C10alkyl(C5-C10aryl);
• An is an anion;
• Ar is C5 or C6 aryl radicals and aromatic bicycles of the naphthyl type, which are optionally substituted with at least one halogen atom, at least one alkyl group, at least one hydroxyl group;
• at least one alkoxy group, at least one hydroxyalkyl group or at least one amino group or (di)alkylamino group;
• R4 is hydrogen or C1-C4alkyl;
• X1 and X2, independently from each other are selected from saturated or unsaturated C1-C30hydrocarbon chains, optionally interrupted by at least one bivalent group chosen from —N(R1)—;
• N+(R1)(R2)—;
• —O —;
• —S—;
• —CO—;
• —SO2—;
• and/or optionally interrupted by an optionally substituted, saturated or unsaturated, fused or non-fused, aromatic or nonaromatic (hetero)cyclic radical optionally comprising at least one identical or different heteroatom;
• V is C1-C3alkylene, optionally substituted by hydroxy;
• D is a radical chosen from —N(CO)—R3;
• Csat and C′sat independently from each other are optionally substituted, optionally cyclic, linear or branched C1-C18alkylene chains;
• R1 and R2, independently from each other are chosen from hydrogen;
• C1-C4alkyl;
• hydroxyalkyl;
• or aminoalkyl;
• R3 is C1-C4alkyl;
• and
• p, q and r independently from each other are 0 or 1.