Abstract
In addition to the intense fluorescence of the J aggregates, pseudoisocyanine dyes have fluorescence bands at longer wavelengths as well as, with UV excitation, a blue emission on the short-wave side of the S 0→S 1 absorption band. The former are to be attributed to the fluorescence of aggregates of different structure. The latter is quenched by aggregate formation and is shown to be the emission of a photo-excited S x state of the monomeric molecules which probably develops due to a 90° twisting of the two quinoline residues. The formation of photochemical degradation products as the cause of the blue fluorescence band was excluded.
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