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Neue Dimethinmerocyaninfarbstoffe mit J‐Aggregation in stark verdünnter Lösung
Author(s) -
Langhals Elke,
Balli Heinz
Publication year - 1985
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19850680633
Subject(s) - chemistry , counterion , cationic polymerization , alkyl , sulfonate , yield (engineering) , methylene blue , salt (chemistry) , absorption (acoustics) , methylene , polymer chemistry , photochemistry , condensation , medicinal chemistry , organic chemistry , sodium , ion , materials science , physics , photocatalysis , acoustics , metallurgy , catalysis , thermodynamics
Novel Dimethinmerocyanine Dyes Performing J‐Aggregation in Highly Diluted Solution A series of various novel long‐chain alkyl‐dimethinmerocyanine dyes containing sulfonate groups is obtained in high yield by modified condensation reactions of sulfoalkyl‐ or sulfophenylsubstituted methylene ketones. The dyes exhibit intense, red‐shifted absorption bands (ϵ up to 263 000) due to J‐aggregation in DMSO/H 2 O mixtures without addition of salt even at dye concentrations of 5 · 10 −8 M. The influence of dye structure and medium on the aggregation tendency is investigated. Besides it is found that exchange of the cationic counterions does not affect J‐aggregation.