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ChemInform Abstract The title compounds (I) are prepared by standard procedures and the syntheses are described in detail. The occurrence of different types of ionic equilibria is observed in low polar solvents. The influence exerted by the polarities of different solvents and by different concentrations of the dyes (I) on the absorption spectra are investigated. These investigations reveal that the coloring of the dyes is determined by their tendency to form associated ion pairs. In low polar solvents these ion pairs adopt a dimeric sandwich-like orientation. The tendency to form ion pairs is increased by introduction of Cl into the positions 6,6' and 6,6'8,8' and by a phenyl group in the meso position.

Aus den N‐Ethylnaphthostyrilen (I) werden nach literaturbekannten Verfahren über die Stufen (II)‐(IV) die Chloride (V) dargestellt und vor der Umsetzung mit HC(OEt3) zu den Carbocyaninfarbstoffen (VI) in die entsprechenden Salze übergeführt.

Die Umsetzung der Z‐Methylthio‐benzindole (I) mit Ammoniumacetat, Anilin, N‐Methylanilin oder Morpholin führt zu den 2‐Aminobzw.

Naphthostyril (I) wird über das 2‐Methylthiobenz[c,d]indolium‐iodid (II) zum Methinfarbstoff (VI) umgesetzt.