Acid—base and distribution equilibria of 5,7-dichloro-2-methyl-8-hydroxyquinoline in Brij-35 micellar media solutions

Beltrán, José Luís; Codony, R.; Granados, Mercè; Izquierdo, A.; Prat, M.D.

doi:10.1016/0039-9140(93)80316-j

Cited by 24 publications

(9 citation statements)

References 13 publications

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“…Many papers and reviews have discussed the effect of micelles on the apparent pK a values of the acids. [2][3][4][5][6][7][8][9][10]30 In the present work we observed the shifts of spectrum in Brij-35, Triton X-100, Triton X-114, Triton X-405 and SDS micelle media systems and then we calculated the pK a values of this reagent in these media. As is clear from Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Also, these changes are due to the hydrophobic and electrostatic interactions of reactants with micellar aggregates. 3,5,9,36,37…”

Section: Resultsmentioning

confidence: 99%

“…Aqueous micellar media are widely used in different areas of analytical chemistry, and several reviews concerning their analytical applications have been published. [1][2][3][4] 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.…”

Section: Introductionmentioning

confidence: 99%

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Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions

Ghasemi

Peyman

Ниази

2007

J Chinese Chemical Soc

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Dissociation equilibria of 4-(2-pyridylazo) resorcinol (PAR) in aqueous micellar solutions were determined spectrophotometrically at 25°C and at the constant ionic strength I = 0.1 M KNO 3 . For this purpose, the effect of nonionic (Brij-35, Triton X-100, Triton X-114, Triton X-405), and anionic (SDS) surfactants on the absorption spectra of PAR at different pH values was studied. Results show that the pK a values and pure spectra of each species of PAR are influenced by percentages of a neutral and an anionic surfactant such as Brij-35, Triton X-100, Triton X-114, Triton X-405 and SDS, respectively, added to the solution of this reagent. Ghasemi et al. Fig. 3. The pure spectra of different forms of PAR in (a) pure water, (b) 0.05% (w/v) Brij-35 to water, (c) 0.05% (w/v) Triton X-100 to water, (d) 0.05% (w/v) Triton X-114 to water, (e) 0.05% (w/v) Triton X-405 to water and (f) 0.05% (w/v) SDS to water.

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Section: Resultsmentioning

confidence: 99%

“…Also, these changes are due to the hydrophobic and electrostatic interactions of reactants with micellar aggregates. 3,5,9,36,37…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions

Ghasemi

Peyman

Ниази

2007

J Chinese Chemical Soc

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“…Dissociation constants can be a key parameter for understanding and quantifying chemical phenomena reaction rates, biological activity, biological uptake, biological transport and environmental fate 5 . Several methods for the determination of dissociation constants, such as potentiometric titration, spectrophotometric determination and conductometry, have been reported 6,7 .…”

Section: Figure 1 the Typical Protection Mechanism Of Benzotriazolementioning

confidence: 99%

Study of β‐Cyclodextrin Effect on Acidity Constant of 2‐(2H‐Benzo(d)(1,2,3) triazol‐2‐yl) phenol by Spectrophotometry

Sarrafi

Konoz

Ghorashi

2010

Journal of Chemistry

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The interaction of solutes withβ-cyclodextrin leads to apparent changes in their chemical properties, such as shifts in their absorption spectra and acid-base equilibrium. Formation of inclusion complexes between acid and/ or base forms of a compound withβ-CD can change the amount of conditional acidity constant. The acidity constants of 2-(2H-benzo (d)(1,2,3)triazol-2-yl)phenol (CFM) in water and in the presence of varying amounts ofβ-cyclodextrin at 25 °C and an ionic strength of 0.1 M have been determined spectrophotometrically. To evaluate the pH-absorbance date, a resolution method based on the combination of soft- and hard-modeling is applied. The acidity constant of all related equilibria are estimated using the whole spectral fitting of the collected data to an established factor analysis model. DATAN program was applied for determination of acidity constant. The pKavalue of CFis 8.50±0.10. The pKa value is decreased by increasingβ-CD concentration.

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“…Dye-surfactant interactions in aqueous buffered systems have been drawing interest of many researchers due to their industrial applications 1 . And aqueous micellar media are widely used in different areas of analytical chemistry and several reviews concerning their analytical applications have been published [2][3][4][5] . One important property of micelles is their ability to solubilize a wide variety of compounds which are insoluble or slightly soluble in water.…”

Section: Introductionmentioning

confidence: 99%

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

Altalbawy¹,

Al-Sherbini²

2013

Asian J. Chem.

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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.

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Acid—base and distribution equilibria of 5,7-dichloro-2-methyl-8-hydroxyquinoline in Brij-35 micellar media solutions

Cited by 24 publications

References 13 publications

Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions

Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions

Study of β‐Cyclodextrin Effect on Acidity Constant of 2‐(2H‐Benzo(d)(1,2,3) triazol‐2‐yl) phenol by Spectrophotometry

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

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