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Spectroscopic study of Alizarin Red S binding with cetyltrimethylammonium bromide at low concentrations
Author(s) -
Gul Fatima,
Khan Asad M,
Shah Syed S,
Nazar Muhammad F
Publication year - 2010
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2010.00236.x
Subject(s) - chemistry , bromide , alizarin red , enthalpy , pulmonary surfactant , cationic polymerization , aqueous solution , moiety , alizarin , gibbs free energy , equilibrium constant , binding constant , inorganic chemistry , organic chemistry , binding site , thermodynamics , medicine , staining , pathology , biochemistry , physics
The anthraquinoid dye, Alizarin Red S, forms an anionic moiety in aqueous solution. The complex formation of this dye was studied with the cationic surfactant, cetyltrimethylammonium bromide, in an aqueous environment at low surfactant concentrations. The complex was studied with the help of ultraviolet–visible spectroscopy. A method of continuous variation was applied to confirm the complex formation and showed that a 1:1 complex was evident from the experimental results. The equilibrium constant for the formation of the complex was determined at various temperatures. Different thermodynamic parameters, free energy of binding, enthalpy of binding and entropy of binding were calculated.