Kinetic and rheological measurements of the effects of inert 2-, 3- and 4-bromobenzoate ions on the cationic micellar-mediated rate of piperidinolysis of ionized phenyl salicylate

Yusof, Nor Saadah Mohd; Khan, M. Niyaz

doi:10.1016/j.jcis.2011.01.061

Cited by 10 publications

(7 citation statements)

References 42 publications

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“…[29] f Ref. [30] g Ref. [31] and polarizability of the halogen substituent of counterions X, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The details of the data analysis have been described elsewhere [30]. The symbol [X] T represents the total concentration of X throughout the text.…”

Section: Kinetic Measurementsmentioning

confidence: 99%

“…It has been shown that the extent of the catalytic effects of CTABr/MX/ H 2 O can give the value of the ion exchange constant, K Br X [26]. The values of K Br X for X = mono-substituted halobenzoate ions at constant [CTABr] T (where CTABr and [] T represent cetyltrimethylammonium bromide and total concentration, respectively) have been determined and listed elsewhere [27][28][29][30][31]. Furthermore, these counterions are known to affect the structural features of cationic micelles nanoparticles [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

Noh

Khalid

Ariffin

et al. 2017

J Surfact & Detergents

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The removal of PSa− from bulk aqueous phase to the pseudo‐micellar phase by halobenzoate counterion X is responsible for the monotonic increase in kobs (pseudo first‐order rate constants) with the increase in the values of [MX] where MX = sodium salts of 2‐, and 4‐halobenzoic acids. The values of ion exchange constants, KnormalXBr or RnormalXBr for X = 2‐ and 4‐halobenzoate ions in the presence of tetradecyltrimethylammonium bromide (TTABr) were calculated from the apparent catalytic rate constants, Xkcat which represent the catalytic effect of CFN. Larger values of KnormalXBr or RnormalXBr were observed for X = 4‐halobenzoate ions than that for X = 2‐halobenzoate ions due to isomeric factors. The values of KnormalXBr or RnormalXBr determined in the presence of TTABr were compared with previously determined KnormalXBr or RnormalXBr values in the presence of cetyltrimethylammonium bromide (CTABr). The values of KnormalXBr or RnormalXBr are nearly 8 ~ 9‐fold larger for 4‐IBz−, 4‐BrBz− and 4‐ClBz− compared to the respective values of X = 2‐IBz−, 2‐BrBz− and 2‐ClBz−. The values of KnormalXBr or RnormalXBr for X = 4‐FBz− is nearly 3‐fold larger than that for X = 2‐FBz−. The values of KnormalXBr or RnormalXBr for X = 2‐ and 4‐halobenzoates are significantly smaller in the presence of TTABr than these in the presence of CTABr nanoparticles.

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“…[29] f Ref. [30] g Ref. [31] and polarizability of the halogen substituent of counterions X, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The details of the data analysis have been described elsewhere [30]. The symbol [X] T represents the total concentration of X throughout the text.…”

Section: Kinetic Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

Noh

Khalid

Ariffin

et al. 2017

J Surfact & Detergents

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“…Equation 2 has been found to explain the observed data in the related reaction systems where the values of k obs showed significant sensitivity to [MX] at [CTABr] T = 0. 17a, 27 The nonlinear least-squares technique was used to calculate the values of F X/S and K X/S from eq 2 considering k 0 and k W MX as the known parameters. These calculated results, obtained at different temperatures, are shown in Table 2.…”

Section: ■ Discussionmentioning

confidence: 99%

“…23,33,34 However, aqueous solutions containing 0.015 M CTABr and varying values of [NaX] reveal the presence of short RM when K X Br = 9.0 as well as long linear flexible, entangled, and branched WM when the values of K X Br range from ∼13 to 71 at 35 °C. 19,27 The increase in temperature from 35 to 55 °C decreased R X Br from 796 to 53 for X = 5-MeSa 2− and from 89 to 7.0 for X = 5-MeOSa 2− (Table 3). Rheometric measurements on 0.0125 M CTABr to ≥0.01 M M 2 X mixtures showed the presence of ULV and long linear, entangled, branched WM for M 2 X = 5-MeSaNa 2 at 35 and 55 °C, respectively.…”

mentioning

confidence: 94%

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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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 and rheological measurements of the effects of inert 2-, 3- and 4-bromobenzoate ions on the cationic micellar-mediated rate of piperidinolysis of ionized phenyl salicylate

Cited by 10 publications

References 42 publications

Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

Counterion‐Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate

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

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