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Vol. 25 No. 11 (2013): Vol 25 Issue 11

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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

https://doi.org/10.14233/ajchem.2013.14305
Farag M.A. Altalbawy
Department of Measurements and Environmental Applications, National Institute of Laser Enhanced Sciences, Cairo University, P.O. Box 12613, Giza, Egypt
El-Sayed A.M. Al-Sherbini
Department of Measurements and Environmental Applications, National Institute of Laser Enhanced Sciences, Cairo University, P.O. Box 12613, Giza, Egypt

Corresponding Author(s) : Farag M.A. Altalbawy

f_altalbawy@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 11 (2013): Vol 25 Issue 11

Abstract

Electronic absorption and excitation spectra of 1-methyl-4-[4'-amino styryl]quinolinium iodide (Q-NH2) were measured in aqueous buffer and micellar solutions. The acid dissociation constants in ground and excited states, pK and pK*, were determined spectrophotometrically and amount for the aqueous solution to 3.24 and 1.19, respectively and the pK and pK* for the (Q-NH2) in sodium dodecyl sulphate are 3.72 and -1.95. The results indicated that the pks of the micellar solution is higher than that of the aqueous solution due to the concentration of protons at the micellar interface which suppress the protonation in the ground state. This reflects the large difference between the excited and the ground state dissociation constants of the micellar solution. The mechanism of the studied reactions is discussed.

Keywords

1-Methyl-4-[4'-amino styryl]quinolinium iodide Acidity constant Spectrophotometric Surfactant
M.A. Altalbawy, F., & A.M. Al-Sherbini, E.-S. (2013). 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, 25(11), 6181–6185. https://doi.org/10.14233/ajchem.2013.14305
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