Über den Einfluss des Akzeptor‐Teilchromophors bei Dimethin‐merocyanin‐Farbstoffen auf das Aggregationsverhalten in wässriger Lösung

On the Influence of the Acceptor Part of the Chromophor of Dimethinemerocyanine Dyes upon the Aggregation Tendency in Aqueous Solution A series of novel long‐chain alkyl‐dimethinemerocyanine dyes containing sulfonate groups is synthesized in good yield and their aggregation tendency in H2O and in organic solvent/H2O mixtures investigated. The merocyanine dyes 11 and 15 only exhibit an intense, red‐shifted absorption band due to J‐aggregation in H2O without addition of salt. The influence of cationic and anionic tensides and other compounds as urea, glucose, and polysaccharides upon the J‐aggregation tendency is investigated.