Fluorescent aggregates Cyan 40 and Thiazole Orange dyes in solution

► The electronic spectra of dyes Cyan 40 and TO in solvents of different nature were studied. ► The dyes Cyan 40 and TO in water and the binary mixture of chloroform + hexane fluorescent aggregates is formed. ► The formation of fluorescent aggregates is explained on the basis of Davidov's theory of molecular excitons.