Pentamethine cyanine azo complex dye compounds for optical data recording

A compound of formula (1),

• An−*Cat+ (I)
• wherein
• Cat+ is a compound of formula (II);
• An− is a compound of formula (III);
• M is a trivalent metal atom;
• R9 is n-butyl, allyl or propargyl;
• R1 is C1-10 alkyl;
• R10, R11, R12 and R13 are identical or different and independently from each other selected from the group consisting of H, CN, CF3, halogen, NO2, OH, SH, SO2—NR21R22, CO—R20, SO2R20, CO—NR21R22,
• C1-10 alkyl, C3-10 cycloalkyl, the C1-10 alkyl and the C3-10 cycloalkyl being independently from each other unsubstituted or substituted by 1 to 4 identical or different substituents, the substituents being independently from each other selected from the group consisting of C1-10 alkyl, halogen, OH, CN, CF3, C6-12 aryl and NR21R22,
• C6-C12 aryl, O—C6-12 aryl, S—C6-12 aryl, the C6-12 aryl and the O—C6-12 aryl and the S—C6-12 aryl being unsubstituted or substituted by 1 to 4 identical or different substituents, the substituents being independently from each other selected from the group consisting of C1-10 alkyl, C3-10 cycloalkyl, OH, NO2, CN, halogen, CF3, C6-12 aryl, O—C1-10 alkyl, S—C1-10 alkyl and NR21R22,
• O—C1-10 alkyl, S—C1-10 alkyl, O—C3-10 cycloalkyl, S—C3-10 cycloalkyl, NHCOR20 and NR21R22;
• with the proviso, that if R9 is n-butyl, then R10 is —NHCOCH3;
• the R21 and R22 residues are identical or different and independently from each other selected from the group consisting of H, C1-10 alkyl, C6-12 aryl and C1-12 alkyl-NR23R24;
• the R23 and R24 residues are identical or different and independently from each other selected from the group consisting of H, C1-10 alkyl and C6-12 aryl;
• the R20 residues are identical or different and independently from each other selected from the group consisting of OH, C1-6 alkyl, C6-10 aryl and O—C1-6 alkyl.