Collect. Czech. Chem. Commun. 1989, 54, 70-80

Effect of tensides on the optical properties of sulfophthalein dyes

Vlastimil Kubáň, Irena Jančářová, Josef Hedbávný and Milan Vrchlabský

Department of Analytical Chemistry, J. E. Purkyně University, 611 37 Brno


The optical properties of bromocresol red, bromophenol blue and bromocresol green were studied spectrophotometrically in aqueous systems in the absence and in the presence of submicellar and micellar concentrations of cationic (Septonex, hexadecylpyridinium and hexadecyltrimethylammonium bromides), nonionic (Brij 35, Triton X-100) and anionic (sodium dodecylsulfate) tensides. The positions of the absorption maxima and molar absorptivities of the LH- and L2- acid-base species of the dyes depend on the kind and concentration of tenside, alkylpyridinium chain length, and kind and concentration of inert electrolyte.