146. Ueber den Einfluss des Donor-Teilchromophors bei Dimethinmerocyanin-Farbstoffen auf das Aggregationsverhalten in waessriger Loesung

Article abstract of DOI:10.1002/hlca.19870700616

A series of novel long-chain alkyl-dimethinmerocyanine dyes containing the (rhodaninyl)benzenesulfonate or (cyanoacetoxy)alkanesulfonate group is synthesized in good yield and their aggregation tendency in H2O and/or in various organic solvents/H2O mixtures without addition of salt investigated.Except for the merocyanine 2h, all dyes give J-aggregation in H2O or in organic solvents containing H2O.The Lambert-Beer rule is proved for the solution of 3a(4) in H2O.The degree of aggregation of 3a(4) in H2O is investigated by ultracentrifugation.The kind of aggregation (J- or H-type) can be found out very quickly by dissolving the dye in H2O with help of ultra sound.