A dye composition comprising, in a suitable cosmetic medium, at least one dye chosen from dyes of formula (I), dyes of formula (II):
- organic acid addition salts, mineral acid addition salts, solvates, tautomers, optical isomers, and geometrical isomers thereof;
- wherein, in formula (I) and formula (II):
- L is chosen from optionally substituted C1-C20 divalent hydrocarbon-based chains optionally interrupted with at least one divalent group, it being understood that two divalent groups or combinations thereof are separated by a C1-C6 divalent hydrocarbon-based chain, said at least one divalent group being chosen from:
- —N(R)—;
- —N+(R)(R0)-An−;
- —O—, —S—, —C(O)—, with R chosen from C1-C4 alkyl groups, C2-C6 (poly)hydroxyalkyl groups, alkoxy (C1-C6)alkyl groups, aryl groups, aryl (C1-C6)alkyl groups, (C1-C4)alkylcarbonylamino (C1-C6)alkyl groups, amino (C1-C4)alkyl groups, the amine of which is substituted with at least one C1-C4 alkyl group which may be identical or different, (C1-C6)alkylcarbonyl groups, and (C1-C4)alkylcarbonylamino groups;
- and R0 is chosen from hydrogen and R;
- cationic heterocyclic and heteroaryl Het+ An− groups, with An− chosen from anionic counterions and Het+ chosen from saturated and unsaturated cationic heterocycles comprising 5 to 10 members and saturated and unsaturated cationic heteroaryls comprising 5 to 10 members;
- noncationic heterocyclic groups comprising 5 to 10 members;
- and
- optionally substituted (hetero) aryl groups;
- with L comprising no diazo, hydrazino, aminooxy, nitro, nitroso or peroxide groups;
- R1 and R4, independently of one another, are each chosen from:
- C1-C4 alkyl groups;
- hydroxyl groups;
- C1-C4 alkoxy groups;
- C2-C4 (poly)hydroxyalkoxy groups;
- alkoxycarbonyl groups (RaO—C(O)—) in which Ra is chosen from C1-C4 alkyl groups;
- alkylcarbonyloxy groups (RaC(O)—O—) in which Ra is chosen from C1-C4 alkyl groups;
- amino groups optionally substituted with at least one C1-C4 alkyl group, which may be identical or different, optionally bearing at least one hydroxyl group, it being possible for the two alkyl groups to optionally form, with the nitrogen atom to which they are attached, a substituted or unsubstituted 5- or 6-membered heterocycle optionally bearing another heteroatom identical to or different from nitrogen;
- alkylcarbonylamino groups (RaC(O)—NR′a—) in which Ra is chosen from C1-C4 alkyl groups and R′a is chosen from hydrogen and C1-C4 alkyl groups;
- (di)(alkyl)aminocarbonyl groups ((Ra)2N—C(O)) in which the Ra groups, which may be identical or different, are each chosen from hydrogen and C1-C4 alkyl groups;
- ureido groups ((Ra)2N—C(O)—NRb—) in which the Ra and Rb groups, independently of one another, are each chosen from hydrogen and C1-C4 alkyl groups;
- guanidinium groups ((Ra)2N—C(═NH2+)—NRb—) in which the Ra and Rb groups, independently of one another, are each chosen from hydrogen and C1-C4 alkyl groups;
- halogens;
- or else two adjacent R4 groups can form, with the carbon atoms to which they are attached, a condensed, aromatic 6-membered ring optionally substituted with at least one group, which may be identical or different, chosen from hydroxyl groups, C1-C4 alkyl groups, hydroxycarbonyl groups (HO(O)C—), alkoxycarbonyl groups (RaO(O)C—) in which Ra is chosen from C1-C4 alkyl groups, (alkyl)sulphonylamino groups (RaS(O)2NRb) in which Ra is chosen from C1-C4 alkyl groups and Rb is chosen from hydrogen and C1-C4 alkyl groups;
- C1-C4 alkoxy groups;
- amino groups optionally substituted with at least one C1-C4 alkyl group, which may be identical or different, and optionally bearing at least one hydroxyl or methylcarbonylamino group, it being possible for the two alkyl groups to optionally form, with the nitrogen atom to which they are attached, a 5- or 6-membered heterocycle optionally bearing another heteroatom identical to or different from nitrogen;
- R2 and R3, independently of one another, are each chosen from:
- hydrogen;
- optionally substituted C1-C6 alkyl groups;
- optionally substituted aryl groups;
- optionally substituted heteroaryl groups;
- optionally substituted aryl (C1-C6)alkyl groups;
- optionally substituted heteroaryl (C1-C6)alkyl groups;
- cycloalkyl(C1-C6)alkyl groups;
- heterocycloalkyl(C1-C6)alkyl groups;
- or else R3, with the nitrogen atom which bears it, and R4, with the carbon atom which bears it, can optionally together form a 5-, 6- or 7-membered heterocycle;
- this heterocycle and the aromatic ring attached to the azo group are then condensed;
- the heterocycle may be saturated or unsaturated, and optionally interrupted with a heteroatom;
- or else two contiguous R2 groups, when n is 2, form, together with the carbon atom which bears them, a benzo group;
- or else R2 and R3 of formula (I) form, together with the nitrogen atom which bears them, a 5-, 6-, or 7-membered heterocycle;
- R5 is directly attached to the quaternized nitrogen atom by means of a carbon atom and is chosen from:
- optionally substituted C1-C6 alkyl groups;
- optionally substituted aryl groups;
- optionally substituted heteroaryl groups;
- optionally substituted aryl (C1-C6)alkyl groups;
- optionally substituted heteroaryl(C1-C6)alkyl groups;
- cycloalkyl(C1-C6)alkyl groups;
- and
- heterocycloalkyl(C1-C6)alkyl groups;
- Y is chosen from:
- hydrogen;
- alkali metals;
- alkaline earth metals;
- ammonium groups N+RαRβRγRδ and phosphonium groups P+RαRβRγRδ, with Rα, Rβ, Rγ, and Rδ, which may be identical or different, each chosen from hydrogen and (C1-C4)alkyl groups;
- and
- thiol-function-protecting groups;
- An is chosen from anionic counterions;
- m is chosen from integers ranging from 0 to 6 inclusive;
- n is chosen from integers ranging from 0 to 4 inclusive;
- x is 1 or 2;
- y is 0 or 1;
- it being understood that:
- if x is 1, then y is 1 and that if x is 2, then y is zero;
- the electroneutrality of the dyes of formula (I) and the dyes of formula (II) is ensured by at least one cosmetically acceptable anionic counterion An, which may or may not be identical.