Study of Cationic and Nonionic Mixed Micelles with NaBr and 3,5-ClCHCONa by Use of Probe Nucleophilic Reaction of Piperidine with Ionized Phenyl Salicylate.

Behaviors of cationic and nonionic mixed micelles in the form of hexadecyltrimethylammonium bromide (HDABr) and hexadecyltrimethylammonium bromide-Polyethylene glycol hexadecyl ether (CE), in the presence of inert salts (NaBr and 3,5-dichlorosodium benzoate), by the use of reaction probe between Pp and ionized PhSH (Pp = piperidine and PhSH = phenyl salicylate), has been reported in this work. The values of R (R denotes ion exchange constants obtained in the presence of micelles of different structural features) or K (K denotes ion exchange constants obtained in the presence of micelles of the same structural features) for 3,5-ClCHCO were almost the same at three different [HDABr] (0.006, 0.

Kinetics and Mechanism of Cationic Flexible Nanoparticles (CFN) - Catalyzed Piperidinolysis of Anionic Phenyl Salicylate: CFN = TTABr/MX/H2O with MX = NaCl, NaBr; CnH2n+1CO2Na, n = 4, 5, 6 and 7.

The present study is focused on the effect of the TTABr/MX/H2O-nanoparticles on the rate of piperidinolysis of ionized phenyl salicylate where TTABr represents tetradecyltrimethylammonium bromide and MX = NaCl, NaBr and CnH2n+1CO2Na with n = 4, 5, 6 and 7. Pseudo-first-order rate constant for the piperidinolysis of ionized phenyl salicylate at 35°C and constant concentration [PSa(-)]T = 0.2 mM, [Pip]T = 0.

Ultraviolet-visible study on acid-base equilibria of aporphine alkaloids with antiplasmodial and antioxidant activities from Alseodaphne corneri and Dehaasia longipedicellata.

The UV-vis spectra of isocorydine 1, norisocorydine 2 and boldine 3 were studied in 2% v/v acetonitrile, at constant ionic strength (0.1 M NaCl, 35 degree Celsius). The pK(a) values of isocorydine 1 and norisocorydine 2 were 11.

Semi-empirical spectrophotometric (SESp) method for the indirect determination of the ratio of cationic micellar binding constants of counterions X⁻ and Br⁻(K(X)/K(Br)).

The semi-empirical spectrophotometric (SESp) method, for the indirect determination of ion exchange constants (K(X)(Br)) of ion exchange processes occurring between counterions (X⁻ and Br⁻) at the cationic micellar surface, is described in this article. The method uses an anionic spectrophotometric probe molecule, N-(2-methoxyphenyl)phthalamate ion (1⁻), which measures the effects of varying concentrations of inert inorganic or organic salt (Na(v)X, v = 1, 2) on absorbance, (A(ob)) at 310 nm, of samples containing constant concentrations of 1⁻, NaOH and cationic micelles. The observed data fit satisfactorily to an empirical equation which gives the values of two empirical constants.

N-(4-Methoxy-phen-yl)phthalimide.

The phthalimide fused-ring system and the phenyl-ene ring in the title compound, C(15)H(11)NO(3), are inclined at an angle of 60.0 (1)°.

N-(2-Methoxy-phen-yl)phthalimide.

The phthalimide fused-ring system and the phenyl-ene ring in the title compound, C(15)H(11)NO(3), are inclined at an angle of 54.2 (1)°.