The acid-base equilibrium of cationic dyes in the aqueous solutions of poly (sodium 4-styrenesulfonate)
Abstract
The acid-base properties have been used to describe the state of indicator dyes in polyelectrolyte microenvironments. The purpose of this study was to determine the absorption spectra and the apparent ionization constant of dyes, Kaa, in the solutions of poly (sodium 4-styrenesulfonate) (NaPSS) and reveal the regularities in Kaa shifts as compared with the values in water, pKaw. The well-known dyes neutral red (NR), acridine orange (AO), and methyl yellow (MY) have been used as indicators. The influence of the polyelectrolyte : dye concentration ratio, [P]/[D], on absorption spectra is discussed in terms of metachromasy. The pKaa values were determined at [P]/[D] ratio of 1 and 60, the ionic strength varied from 0.01 to 0.05 M. It was found that the absorption spectra of the protonated forms of NR and AO strongly depend on the [P]/[D] ratio due to dye-dye interaction, whereas the absorption spectra of MY virtually don’t alter with the change of [P]/[D] ratio. The pKaa shifts for all examined dyes were positive mainly due to electrostatic interaction. The optimal conditions for the pKaa shifts determination also are considered.
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