Kinetic Study on the Effects of Sodium Benzoate on Piperidinolysis of Phenyl Salicylate in Alkaline Pure Cationic and Mixed Cationic-Nonionic Micelles

Khan, M. Niyaz; Ismail, Emran

doi:10.1080/01932690903167558

Cited by 12 publications

(1 citation statement)

References 27 publications

(30 reference statements)

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“…28 These observations reveal that apparent hydrophobicity of 5-MeOSa 2− is larger than that of Sa 2− . However, the value of K X Br for X = C 6 H 5 CO 2 − (K X Br = 5.0, 5.8, 16 5.9 29 ) is similar to that for X = 4-MeOC 6 H 4 CO 2 − (K X Br = 5.2 16 ). These results show that the apparent hydrophobicity of C 6 H 5 CO 2 − is not appreciably different from that of 4-MeOC 6 H 4 CO 2…”

Section: ■ Discussionmentioning

confidence: 91%

Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions

Yusof

Khan

2012

J. Phys. Chem. B

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The semiempirical kinetic method has been used to determine the ratio of cetyltrimethylammonium bromide, CTABr, micellar binding constants of counterions X (K(X)) and Br (K(Br)), i.e., K(X)/K(Br) (= R(X)(Br)) for X = dianionic 5-methyl- and 5-methoxysalicylate ions. The values of K(X) and K(Br) have been derived from the kinetic parameters obtained in the presence of spherical/nonspherical and spherical micelles, respectively. The values of R(X)(Br) remain essentially independent of [CTABr] within its range 0.005-0.015 M for both dianionic 5-methyl- and 5-methoxysalicylate ions. The increase in temperature from 35 to 55 °C decreases the values of R(X)(Br) from 796 to 53 for 5-methylsalicylate ions and from 89 to 7.0 for 5-methoxysalicylate ions. Rheological properties of 0.015 M CTABr solutions containing ≥0.01 M counterionic salt, M(2)X, show indirectly the presence of unilamellar vesicles, ULV, and long linear, entangled, and branched wormlike micelles, WM, at, respectively, 35 and 55 °C for X = dianionic 5-methylsalicylate ion. However, such studies show WM and probable spherical micelles, SM, at, respectively, 35 and 55 °C for X = dianionic 5-methoxysalicylate ions. It has been shown that, at a constant [CTABr], the micellar structural transitions from SM-to-WM-to-vesicles may be correlated quantitatively with the values of R(X)(Br) regardless of whether such micellar structural transitions occur due to variation in the values of [M(2)X] at a constant temperature or due to variation in temperature at a constant [M(2)X].

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Section: ■ Discussionmentioning

confidence: 91%

Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions

Yusof

Khan

2012

J. Phys. Chem. B

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Cover Picture: Separation of Time‐Resolved Phenomena in Surface‐Enhanced Raman Scattering of the Photocatalytic Reduction of p‐Nitrothiophenol (ChemPhysChem 3/2015)

Lantman

Peinder²,

Mank

et al. 2015

ChemPhysChem

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The analysis of nanoscale processes is challenging, as the measurement volume is linked to a discrete number of molecules, ruling out any ensemble averaging. Raman spectroscopy allows chemical changes to be monitored, but is not very sensitive when applied directly. Surface‐enhanced Raman spectroscopy can be used for studying reaction kinetics, but adds additional variability in the signal as the enhancement factor is not the same for every location. On B. M. Weckhuysen et al. describe a chemometric method that separates reaction kinetics from short‐term variability. It is possible to study effects that occur on different time scales independently without data reduction. By using this approach a better description of the nanoscale reaction kinetics becomes available, and the short‐term variations can be studied separately to examine reorientation and diffusion effects. It may even be possible to identify reaction intermediates through this approach.

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Quantitative correlation between counterion (X) binding affinity to cationic micelles and X – Induced micellar growth for substituted iodobenzoates (X)

Yusof

Said

Khan

2017

Arabian Journal of Chemistry

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Kinetic Study on the Effects of Sodium Benzoate on Piperidinolysis of Phenyl Salicylate in Alkaline Pure Cationic and Mixed Cationic-Nonionic Micelles

Cited by 12 publications

References 27 publications

Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions

Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions

Cover Picture: Separation of Time‐Resolved Phenomena in Surface‐Enhanced Raman Scattering of the Photocatalytic Reduction of p‐Nitrothiophenol (ChemPhysChem 3/2015)

Quantitative correlation between counterion (X) binding affinity to cationic micelles and X – Induced micellar growth for substituted iodobenzoates (X)

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