Basic bisazo compounds

A compound of formula (I)

• where
• R0 is a substituted or an unsubstituted C1 to C4 alkyl group,
• R1 is selected from the group consisting of:
• H, N(R7′R7″), a substituted C1 to C4 alkyl group, an unsubstituted C1 to C4 alkyl group, and CN,
• R2 or R2′ are selected from the group consisting of:
• H, a substituted C1 to C4 alkyl group, an unsubstituted C1 to C4 alkyl group, and a group with the formula
• [(CR8R8′)—(CR9R9′)m—(CR10R10′)n—(CR11R11′)o]—NR12R12′
• wherein
• m, n and o are 1 or 0,
• R8, R8′, R9, R9′, R10, R10′, R11or R11′ are independently selected from the group consisting of:
• H, a substituted C1 to C4 alkyl group, and or an unsubstituted C1 to C4 alkyl group;
• and R12 or R12′ are independently selected from the group consisting of:
• H, a substituted C1 to C4 alkyl group, and an unsubstituted C1 to C4 alkyl group,
• R3 is selected from the group consisting of:
• H, a substituted C1 to C4 alkyl group, an unsubstituted C1 to C4 alkyl group, a substituted C1 to C4 alkoxy group, and an unsubstituted C1 to C4 alkoxy group,
• R4 is selected from the group consisting of:
• H, a substituted C1 to C4 alkyl group, an unsubstituted C1 to C4 alkyl group, a substituted C1 to C4 alkoxy group, and an unsubstituted C1 to C4 alkoxy group,
• R5 is selected from the group consisting of:
• H, substituted C1 to C9 alkyl group, and an unsubstituted C1 to C9 alkyl group, wherein the C1 to C9 alkyl group is a branched or linear C1 to C9 alkyl group,
• R6 is selected from the group consisting of:
• a substituted C1 to C9 alkyl group, an unsubstituted C1 to C9 alkyl group, an unsubstituted aryl group, and a substituted aryl group, wherein the C1 to C9 alkyl group is a branched or linear C1 to C9 alkyl group,
• wherein the sum of carbon atoms of R5 and R6 is at least 4 carbon atoms,
• R7′ or R7″ are independently selected from the group consisting of:
• a substituted C1 to C4 alkyl group, an unsubstituted C1 to C4 alkyl group, and R7′ and R7″ form together with the nitrogen atom a five or six membered aromatic or a five or six membered cyclo alipahatic, wherein the five or six membered rings are substituted by a C1 to C4 alkyl group or the five or six membered rings are not further substituted.