Abstract: The aggregated state of eight thiacarbocyanine dyes adsorbed on three kinds of AgBr(I) emulsion (cubic, octahedral and tabulargrain) was investigated. Experimental results showed that the formation of J-aggregate mainly depends on the dye structure, secondly depends on the property of the crystal of AgX-emulsion. Three different kinds of surfactants affected on the formation of the aggregates of dyes. Amphoteric surfactant is the strongest, secondly anionic surfactant, neutral surfactant is rather weak. The aggregated states of two meso-methyl-sub-stituted thiacarbocyanine dyes are evidently influenced by surfactants, giving very strong J-aggregate. But aggregates for other six dyes are influenced slightly.

Key words: aggregated state, thiacarbocyanine dye, surfactant