Heteroassociates of singly- and doubly-charged anions of alizarin red S with the pinacyanol cation

Abstract

The formation of heteroassociates of singly and doubly charged anions of alizarin red S with the cation of the cyanine dye pinacyanol in an aqueous solution was considered. The most probable structure of the heteroassociates was proposed on the basis of the data of spectro photometry and theoretical calculations (quantum chemical methods of determination of the geometry of the structures and the enthalpy of formation). The destructive effect of the ionic surfactants on the heteroassociates was established, and the kinetics of their destruction was studied.

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

“…The association of the "dye -surfactant" type has a special interest due to certain features (the presence of spectral changes at sufficiently low concentrations of reagents at the level of 10 -6 M and even less). In general, association models and thermodynamics (association constants, enthalpy of formation and Gibbs energy) and other parameters (surface tension, the surface area per surfactant molecule at the water/air interface and others) were determined for different classes of dyes [9][10][11][12][13][14][15][16][17][18][19]. There are studies to find effective ways to extract some dyes from various media using surfactants [20][21][22][23].…”

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

“…The association of the "dye -surfactant" type has a special interest due to certain features (the presence of spectral changes at sufficiently low concentrations of reagents at the level of 10 -6 M and even less). In general, association models and thermodynamics (association constants, enthalpy of formation and Gibbs energy) and other parameters (surface tension, the surface area per surfactant molecule at the water/air interface and others) were determined for different classes of dyes [9][10][11][12][13][14][15][16][17][18][19]. There are studies to find effective ways to extract some dyes from various media using surfactants [20][21][22][23].…”