An empirical approach to study the occurrence of ion exchange in the ionic micellar-mediated semi-ionic reactions: Kinetics of the rate of reaction of piperidine with ionized phenyl salicylate in the presence of cationic micelles

2001 ◽  
Vol 33 (5) ◽  
pp. 288-294 ◽  
Author(s):  
M. Niyaz Khan ◽  
Emaran Ismail
Keyword(s):  
Ion Exchange ◽  
Empirical Approach ◽  
Phenyl Salicylate ◽  
Cationic Micelles ◽  
Rate Of Reaction ◽  
Ionic Reactions ◽  
Kinetics Of

Counterion micellar effects upon the reaction of low-spin diimine iron(II) complexes

1989 ◽  
Vol 67 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Francisco Ortega ◽  
Elvira Rodenas
Keyword(s):  
Ion Exchange ◽  
Exchange Model ◽  
Micellar Solutions ◽  
Micellar Effects ◽  
Hydroxide Ion ◽  
Cationic Micelles ◽  
Rate Effects ◽  
Rate Of Reaction

The rate of reaction of tris(1,10-phenanthroline)iron(II) ion (1a), tris(3,4,7,8-tetramethyl-1,10-phenanthroline)iron(II) ion (1b), and tris(4,7-diphenhyl-1, 10-phenanthroline)iron(II) ion (1c) with hydroxide ion, in cationic micelles, is strongly affected by the concentration of micellar counterion in solution. The reaction of la in CTACl is modestly speeded up by the addition of added KCl, while the reactions of 1b and 1c are strongly inhibited by the addition of large amounts of KCl and KBr to micellar solutions of CTACl and CTABr, respectively. These rate effects fit the pseudophase-ion exchange model, assuming the binding of the substrates to the micelles depends upon the counterion concentration. Keywords: counterion micellar effects, low-spin diimine iron(II) complexes.

Dissolution Kinetics of Phlogopite. II. Open System Using an Ion-Exchange Resin

1981 ◽  
Vol 29 (2) ◽  
pp. 107-112 ◽  
Author(s):  
Charles V. Clemency
Keyword(s):  
Ion Exchange ◽  
Open System ◽  
Exchange Resin ◽  
Dissolution Kinetics ◽  
Ion Exchange Resin ◽  
Kinetics Of

THE ALKALINE CLEAVAGE OF o-NITROBENZYLTRIMETHYLSILANE SOLVENT EFFECTS IN THE DIOXANE–WATER SYSTEM

1963 ◽  
Vol 41 (6) ◽  
pp. 1525-1530 ◽  
Author(s):  
H. R. Allcock
Keyword(s):  
Transition State ◽  
Solvent Effects ◽  
Water System ◽  
Solvent Polarity ◽  
High Water ◽  
Aqueous Dioxane ◽  
Alkaline Cleavage ◽  
Rate Of Reaction ◽  
Kinetics Of

The kinetics of alkaline cleavage of o-nitrobenzyltrimethylsilane were examined in aqueous dioxane media. At high water concentrations, increases in solvent polarity retard the cleavage, as required by a mechanism involving charge dispersion in the transition state. At high dioxane concentrations, solvent polarity increases are accompanied by increases in the rate of reaction, a result which may reflect association between the solvent components.

scholarly journals Kinetics of thiamin cleavage by sulphite

1969 ◽  
Vol 113 (4) ◽  
pp. 611-615 ◽  
Author(s):  
J. Leichter ◽  
M. A. Joslyn
Keyword(s):  
Aqueous Solutions ◽  
Rate Constant ◽  
Sulphur Dioxide ◽  
First Order ◽  
Ph Values ◽  
Rate Of Reaction ◽  
Kinetics Of

Results are presented on the rate of thiamin cleavage by sulphite in aqueous solutions as affected by temperature (20–70°), pH(2·5–7·0), and variation of the concentration of either thiamin (1–20μm) or sulphite (10–5000μm as sulphur dioxide). Plots of the logarithm of percentage of residual thiamin against time were found to be linear and cleavage thus was first-order with respect to thiamin. At pH5 the rate was also found to be proportional to the sulphite concentration. In the pH region 2·5–7·0 at 25° the rate constant was 50m−1hr.−1 at pH5·5–6·0, and decreased at higher or lower pH values. The rate of reaction increased between 20° and 70°, indicating a heat of activation of 13·6kcal./mole.

Kinetics of Alkali Metal Ion Exchange into Nanotubular and Nanofibrous Titanates

2007 ◽  
Vol 111 (40) ◽  
pp. 14644-14651 ◽  
Author(s):  
Dmitry V. Bavykin ◽  
Frank C. Walsh
Keyword(s):  
Ion Exchange ◽  
Alkali Metal ◽  
Metal Ion ◽  
Alkali Metal Ion ◽  
Metal Ion Exchange ◽  
Kinetics Of
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