Bordeaux‐R interactions with surfactants: thermochromic investigations of proton ionisation in cationic, nonionic and anionic surfactant solutions

Apparent thermodynamic parameters for the hydroxy proton ionisation of Bordeaux-R were obtained in micellar solutions using the thermochromic method. The effect of addition of the surfactants CTAB, TX-100 and SDS was investigated in buffered solutions in the pH range of 6–13. Ionisation constants in water and in the presence of surfactants were determined spectrophotometrically and the pK′ of Bordeaux-R in water was found to be 10.90 in the absence of surfactant. However, at concentrations above critical micelle concentration, pK′ dropped to 10.14 with CTAB, increased to 11.29 with TX-100 but was insensitive to SDS addition. Standard enthalpies and entropies of ionisation were obtained using the thermochromic method. This method, in conjunction with pK and spectral measurements and comparison with different azo dyes, has been shown to provide detailed information on the mechanism of dye–surfactant interaction.

[1]  J. Oakes,et al.  Physical interactions of dyes in solution – influence of dye structure on aggregation and binding to surfactantsJpolymers , 2008 .

[2]  S. Batchelor,et al.  Understanding adsorption phenomena: investigation of the dye-cellulose interaction. , 2006, The journal of physical chemistry. B.

[3]  F. Jumean,et al.  Azo dyes interactions with surfactants. Determination of the critical micelle concentration from acid–base equilibrium , 2005 .

[4]  F. Jumean,et al.  Acid alizarin violet interactions with surfactants: ionization and thermodynamic parameters in buffered cationic, anionic and nonionic surfactant solutions , 2004 .

[5]  J. Oakes,et al.  Solubilisation of dyes by surfactant micelles. Part 2: Molecular interactions of azo dyes with cationic and zwitterionic surfactants , 2003 .

[6]  K. Takrouri,et al.  Effect of surfactants on the thermodynamic properties of Methyl Orange dye in buffered solutions , 2002 .

[7]  J. Oakes.  Principles of colour loss. Part 1: Mechanisms of oxidation of model azo dyes by detergent bleaches , 2002 .

[8]  Gallardo,et al.  Location of Pinacyanol in Micellar Solutions of N-Alkyl Trimethylammonium Bromide Surfactants. , 2001, Journal of colloid and interface science.

[9]  J. Oakes,et al.  Combined kinetic and spectroscopic study of oxidation of azo dyes in surfactant solutions by hypochlorite , 2000 .

[10]  I. Němcová,et al.  Aggregation of o,o′- Dihydroxy azo Dyes III. Effect of cationic, anionic and non-ionic surfactants on the electronic spectra of 2-hydroxy-5-nitrophenylazo-4-[3-methyl-1-(4″-sulfophenyl)-5-pyrazolone] , 2000 .

[11]  M. Sarkar,et al.  Spectral studies of methyl violet in aqueous solutions of different surfactants in supermicellar concentration region , 1999 .

[12]  I. Němcová,et al.  Aggregation of o,o′-dihydroxyazo dyes–1. Concentration, temperature, and solvent effect , 1999 .

[13]  Rajani K. Behera,et al.  Dye–Surfactant Interaction: Role of an Alkyl Chain in the Localization of Styrylpyridinium Dyes in a Hydrophobic Force Field of a Cationic Surfactant (CTAB) , 1997 .

[14]  Andrew Mills,et al.  THE COMPARATIVE SOLVATOCHROMISM OF ARYLAZO AND HETEROARYLAZO COMPOUNDS BASED ON N, N-DIETHYL-M-ACETYLAMINOANILINE AND N, N-DIETHYL-M-TOLUIDINE , 1997 .

[15]  A. El-Aal,et al.  EFFECT OF ELECTROLYTES AND ORGANIC SOLVENTS ON THE AGGREGATION OF SOME ACID DYES , 1996 .

[16]  A. El-Aal,et al.  Aggregation Behaviour of Some Reactive Dyes , 1995 .

[17]  N. Badawy,et al.  The Influence of Simple Electrolyte on the Behaviour of Some Acid Dyes in Aqueous Media , 1995 .

[18]  D. Whitten,et al.  Multiple Aggregation of Surfactant Squaraines in Langmuir-Blodgett Films and in DMSO-Water Mixtures , 1994 .

[19]  J. Podlahová,et al.  A Study of the Interaction of Triton X-100 with Methyl-Orange , 1991 .

[20]  K. Vytras,et al.  Dissociation constants of some o,o'-substituted azo dyes. , 1990, Talanta.

[21]  D. R. Waring,et al.  The chemistry and application of dyes , 1990 .

[22]  P. V. von Hippel,et al.  DNA-protein interactions. , 1972, Annual review of biochemistry.

[23]  L. Hansen,et al.  Thermodynamics of proton ionization in dilute aqueous solution. Part XI. pK, ΔH°, and ΔS° values for proton ionization from protonated amines at 25° , 1969 .

[24]  A. Peacocke,et al.  The interaction of aminoacridines with nucleic acids , 1968, Hoppe-Seyler's Zeitschrift fur physiologische Chemie.

[25]  M. Waring,et al.  Complex formation between ethidium bromide and nucleic acids. , 1965, Journal of molecular biology.

[26]  D. F. Bradley,et al.  Aggregation of Acridine Orange Bound to Polyanions: The Stacking Tendency of Deoxyribonucleic Acids , 1961 .

[27]  S. D. Hamann,et al.  Energy and entropy changes of organic reactions. Part I.—Two-stage reactions , 1951 .