Structure of Micellar Head-Groups and the Hydrolysis of Phenyl Chloroformate − The Role of Perchlorate Ion

Micellar medium effects on the hydrolysis of phenyl chloroformate in ionic, zwitterionic, nonionic, and mixed micellar solutions

“…Finally, the hydrolysis of phenyl chloroformate is faster in the SB3‐14 and in SB3‐16 sulfobetaine micellar solutions than in the rest of the disperse media studied. This result was also found by Brinchi et al in SB3‐14 micellar solutions 9, their k m value is in good agreement with that found in this work. In the mixed SDS/Brij 35 micellar solutions, and according to the trend found for the k m values, the rate of hydrolysis increases by decreasing the SDS molar fraction from 1 to 0.67.…”

“…Table I shows the values of k m and K m obtained from the fittings. The values of these magnitudes for SB3‐14 solutions agree with those previously found 9. In the case of SDS and CTAB micellar solutions, the k m values found in this work are smaller than those in the literature 9.…”

Micellar medium effects on the hydrolysis of phenyl chloroformate in ionic, zwitterionic, nonionic, and mixed micellar solutions

“…Finally, the hydrolysis of phenyl chloroformate is faster in the SB3‐14 and in SB3‐16 sulfobetaine micellar solutions than in the rest of the disperse media studied. This result was also found by Brinchi et al in SB3‐14 micellar solutions 9, their k m value is in good agreement with that found in this work. In the mixed SDS/Brij 35 micellar solutions, and according to the trend found for the k m values, the rate of hydrolysis increases by decreasing the SDS molar fraction from 1 to 0.67.…”

“…Table I shows the values of k m and K m obtained from the fittings. The values of these magnitudes for SB3‐14 solutions agree with those previously found 9. In the case of SDS and CTAB micellar solutions, the k m values found in this work are smaller than those in the literature 9.…”

Kinetic Study in Water−Ethylene Glycol Cationic, Zwitterionic, Nonionic, and Anionic Micellar Solutions

“…Given that the core of the micelles is supposed to be dry, the reaction seems to take place in the Stern region. This idea is in agreement with literature data showing that phenyl chloroformate molecules reside in the surface regions of micelles 18e. Deacylations are slowed by a decrease in the solvent polarity and in the water content.…”

Conductometric, Surface Tension, and Kinetic Studies in Mixed SDS−Tween 20 and SDS−SB3-12 Micellar Solutions

“…It was found that the presence of an HBr concentration within the range 10 -3 −10 -2 mol dm -3 does not affect the rate constant. The value of the rate constant in water was 14.1 × 10 -3 s -1 at 298.2 K, in agreement with previous results …”

Micellar medium effects on the hydrolysis of phenyl chloroformate in ionic, zwitterionic, nonionic, and mixed micellar solutions

“…Finally, the hydrolysis of phenyl chloroformate is faster in the SB3‐14 and in SB3‐16 sulfobetaine micellar solutions than in the rest of the disperse media studied. This result was also found by Brinchi et al in SB3‐14 micellar solutions 9, their k m value is in good agreement with that found in this work. In the mixed SDS/Brij 35 micellar solutions, and according to the trend found for the k m values, the rate of hydrolysis increases by decreasing the SDS molar fraction from 1 to 0.67.…”

“…Table I shows the values of k m and K m obtained from the fittings. The values of these magnitudes for SB3‐14 solutions agree with those previously found 9. In the case of SDS and CTAB micellar solutions, the k m values found in this work are smaller than those in the literature 9.…”

Kinetic Study in Water−Ethylene Glycol Cationic, Zwitterionic, Nonionic, and Anionic Micellar Solutions

“…Given that the core of the micelles is supposed to be dry, the reaction seems to take place in the Stern region. This idea is in agreement with literature data showing that phenyl chloroformate molecules reside in the surface regions of micelles 18e. Deacylations are slowed by a decrease in the solvent polarity and in the water content.…”

Conductometric, Surface Tension, and Kinetic Studies in Mixed SDS−Tween 20 and SDS−SB3-12 Micellar Solutions

“…It was found that the presence of an HBr concentration within the range 10 -3 −10 -2 mol dm -3 does not affect the rate constant. The value of the rate constant in water was 14.1 × 10 -3 s -1 at 298.2 K, in agreement with previous results …”

Micellar medium effects on the hydrolysis of phenyl chloroformate in ionic, zwitterionic, nonionic, and mixed micellar solutions

“…Finally, the hydrolysis of phenyl chloroformate is faster in the SB3‐14 and in SB3‐16 sulfobetaine micellar solutions than in the rest of the disperse media studied. This result was also found by Brinchi et al in SB3‐14 micellar solutions 9, their k m value is in good agreement with that found in this work. In the mixed SDS/Brij 35 micellar solutions, and according to the trend found for the k m values, the rate of hydrolysis increases by decreasing the SDS molar fraction from 1 to 0.67.…”

“…Table I shows the values of k m and K m obtained from the fittings. The values of these magnitudes for SB3‐14 solutions agree with those previously found 9. In the case of SDS and CTAB micellar solutions, the k m values found in this work are smaller than those in the literature 9.…”

Kinetic Study in Water−Ethylene Glycol Cationic, Zwitterionic, Nonionic, and Anionic Micellar Solutions

“…Given that the core of the micelles is supposed to be dry, the reaction seems to take place in the Stern region. This idea is in agreement with literature data showing that phenyl chloroformate molecules reside in the surface regions of micelles 18e. Deacylations are slowed by a decrease in the solvent polarity and in the water content.…”

Conductometric, Surface Tension, and Kinetic Studies in Mixed SDS−Tween 20 and SDS−SB3-12 Micellar Solutions

“…It was found that the presence of an HBr concentration within the range 10 -3 −10 -2 mol dm -3 does not affect the rate constant. The value of the rate constant in water was 14.1 × 10 -3 s -1 at 298.2 K, in agreement with previous results …”