Compound, especially marker-dye, on the basis of polymethines

Compound, in particular marker-dye, on the basis of polymethines having the general formulas I-III

• 18
• where
• R1-R12 are the same or different and can be any of the following:
• one or more chlorine and/or bromine atoms, alkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, alkyloxy, alkylmercapto, aryloxy, arylmercapto, heteroaryloxy, heteroarylmercapto or cyano residues,
• one or more hydroxy functions,
• one or more alkyl-substituted or cyclic amino functions;
• and R1 and R2 and/or R3 and R4 and/or R7 and R8 and/or R9 and R10 can form additional aliphatic or aromatic rings, and/or two adjacent residues, e.g. R5 and R6, and in examples I or II R11 and R12, together can form one or more aliphatic or aromatic rings,
• X—Y together can stand for an element in the group O, S, Se, Te or the structural element (CR2)n, NR or SO2, wherein R can take on the same one or different ones of the functions of R1- R12, and n can stand for 1-4,
• X—Y can stand for the structural elements —CR2—O—, —O—CR2—, —CO—O, —O—CO—, —CO—NR— or —NR—CO—, wherein R can take on the same one or different ones of the functions of R1- R12.