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Dye-surfactant interactions in aqueous buffered systems have been drawing interest of many researchers due to their industrial applications. And aqueous micellar media are widely used in different areas of analytical chemistry and several reviews concerning their analytical applications have been published. One important property of micelles is their ability to solubilize a wide variety of compounds which are insoluble or slightly soluble in water. The incorporation of a solute into micellar systems can lead to important changes in its molecular properties. Another important effect of micellar systems is that they can modify reaction rates and, to some extent, the nature of the products. Micelles can inhibit or accelerate reaction rates (by up to several orders of magnitude) and also shift equilibria (acid-base). Surfactants usually affect spectral parameters: the intensity and shifts in the absorption bands can be increased and shifts in the absorption maxima of reagents are observed. Micelles can affect the apparent pKa values of the reagents due to a combination of electrostatic and microenvironment effects of the micelle. Moreover, the acid-base equilibrium involved in these systems is also influenced by surfactants. The acid dissociation constants (i.e., pKa values) can be a key parameter for understanding and quantifying chemical phenomena such as reaction rates, biological activity, biological uptake, biological transport and environmental fate. Spectrophotometric Determination of Acidity Constant of 1-Methyl-4-[4'-aminostyryl]quinolinium Iodide in Aqueous Buffer and Micellar Solutions in the Ground and Excited States

asian journal of chemistry/asian journal of chemistry

Spectrophotometric Determination of Acidity Constant of 1-Methyl-4-[4'-aminostyryl]quinolinium Iodide in Aqueous Buffer and Micellar Solutions in the Ground and Excited States