Study of association thermodynamics between crystal violet and sodium bis(2‐ethylhexyl)sulfosuccinate and kinetics of basic fading of crystal violet in microemulsions

Abstract

The thermodynamics of the association between 4,4 ,4 -tris(dimethylamino)triphenylmethyl chloride (crystal violet or CV) and sodium bis(2-ethylhexyl)sulfosuccinate (aerosol OT or AOT) in water/AOT/n-decane microemulsion and the kinetics of the basic hydrolysis of CV in a water-in-oil microemulsion were investigated by UV-vis spectroscopic measurements. An association model of CV and AOT was used to analyze the experimental data to obtain the association constants at various temperatures. By taking the association into account, the "actual" rate constants and the activation energies of the basic hydrolysis of CV in the media of water/AOT/oil were obtained. The difference in thermodynamics and kinetics between the two media of water/AOT/n-decane and water/AOT/isooctane is discussed. C

Kinetics and thermodynamics of hydrolysis of crystal violet at ambient and below ambient temperatures

“…Literature information on the activation energy of hydrolysis of crystal violet are scanty, although, some researchers have reported some information about the reaction of crystal violet with sodium hydroxide 5 – 9 , the depths of most of the reports are not sufficient to give extensive information on the kinetics and thermodynamics information of the hydrolysis reaction. This work is aimed at determining the kinetic and thermodynamic parameters of hydrolysis of crystal violet at ambient and below ambient temperatures.…”

Diels‐Alder Reaction in microemulsions with ionic liquid

“…), where solubility problems can be overcome. The reaction rate was effected by the IL‐water pool nature and the concentration of surfactants in the IL‐Ms . In order to explore the effect of microstructure and nature of IL‐water pool on the apparent reaction rate constant, a series of the DA reactions was studied in the IL‐Ms with various AOT concentrations ( C AOT ) and molar ratios of water to surfactant ( ω ), and results were listed in Table .…”

“…indicate that the apparent rate constant increases with AOT concentration ( C AOT ) in the IL‐Ms. It may be due to the number of IL‐water pool in the IL‐Ms increases with AOT concentration, and it brings on change of microenvironment polarity, interface and IL‐water pool microstructure. Consequently, increase of both ω and C AOT results in the reaction rate increase.…”

“…The temperature has a strong influence on the apparent reaction rate as shown in Table . Figure illustrates the k 2 increases with temperature in the IL‐Ms with fixed C AOT (0.6M) and ω (20); it is because the microstucture and water properties of IL‐water pool in IL‐Ms were altered by temperature . Figure reveals plots of –ln k 2 versus C AOT in the IL‐Ms with various ω at different temperature.…”

Cleavage of Carbofuran and Carbofuran-Derivatives in Micellar Aggregates

“…In particular, we will now present the influence of micelles (anionic, cationic and non-ionic) and reverse micelles (water/oil microemulsions) upon the cleavage of carbofuran and carbofuran-derivatives. These microheterogeneous media are known to affect chemical reactions and, there have been many reports of their catalytic or inhibitory effect upon the basic hydrolysis both for micelles [8][9][10][11][12][13][14][15][16][17] and for reverse micelles [18][19][20][21].…”