Kinetics of proton transfer between metasubstituted benzoic acids and the carbinol base of crystal violet in toluene: Specific solvent effect-free metasubstituent effect on the reactivity of benzoic acids

2011 ◽  
Vol 43 (6) ◽  
pp. 303-311 ◽  
Author(s):  
Susanta K. Sen Gupta ◽  
V. Radha Rani
Keyword(s):  
Proton Transfer ◽  
Solvent Effect ◽  
Crystal Violet ◽  
Benzoic Acids ◽  
Kinetics Of

Kinetics and Mechanism of Proton Transfer between Disubstituted Benzoic Acids and Carbinol Base of Crystal Violet in Chlorobenzene

2008 ◽  
Vol 112 (14) ◽  
pp. 3031-3035 ◽  
Author(s):  
Susanta K. Sen Gupta ◽  
Ruchi Shrivastava
Keyword(s):  
Proton Transfer ◽  
Crystal Violet ◽  
Kinetics And Mechanism ◽  
Benzoic Acids

Kinetics and Mechanism of Decomposition of 1,3-Bis(4-methylphenyl)triazene Catalyzed with Substituted Benzoic Acids in 25% Aqueous Methanol-General or Specific Catalysis?

1994 ◽  
Vol 59 (9) ◽  
pp. 2029-2041
Author(s):  
Oldřich Pytela ◽  
Taťjana Nevěčná
Keyword(s):  
Benzoic Acids ◽  
Hammett Equation ◽  
Aqueous Methanol ◽  
Mechanism Of Decomposition ◽  
Kinetics Of Decomposition ◽  
Independent Variable ◽  
Amino Derivatives ◽  
Substituted Benzoic Acids ◽  
The Individual ◽  
Kinetics Of

The kinetics of decomposition of 1,3-bis(4-methylphenyl)triazene catalyzed with 13 substituted benzoic acids of various concentrations have been measured in 25 vol.% aqueous methanol at 25.0 °C. The rate constants observed (297 data) have be used as values of independent variable in a series of models of the catalyzed decomposition. For the catalytic particles were considered the undissociated acid, its conjugated base, and the proton in both the specific and general catalyses. Some models presumed formation of reactive or nonreactive complexes of the individual reactants. The substituent effect is described by the Hammett equation. The statistically best model in which the observed rate constant is a superposition of a term describing the dependence on proton concentration and a term describing the dependence on the product of concentrations of proton and conjugated base is valid with the presumption of complete proton transfer from the catalyst acid to substrate, which has been proved. The behaviour of 4-dimethylamino, 4-amino, and 3-amino derivatives is anomalous (lower catalytic activity as compared with benzoic acid). This supports the presumed participation of conjugated base in the title process.

Kinetics of Ion-Pair Effect of Aquation of Bromopentaammine Cobalt(III) Complex in Different Dicarboxylate Media

2011 ◽  
Vol 324 ◽  
pp. 166-169 ◽  
Author(s):  
Farah Zeitouni ◽  
Gehan El-Subruiti ◽  
Ghassan Younes ◽  
Mohammad Amira
Keyword(s):  
Free Energy ◽  
Solvent Effect ◽  
Compensation Effect ◽  
Ion Pairing ◽  
Reaction Rates ◽  
Ion Pair ◽  
Free Energy Of Activation ◽  
Different Types ◽  
Different Temperatures ◽  
Kinetics Of

The rate of aquation of bromopentaammine cobalt(III) ion in the presence of different types of dicarboxylate solutions containing tert-butanol (40% V/V) have been measured spectrophotometrically at different temperatures (30-600°C) in the light of the effects of ion-pairing on reaction rates and mechanism. The thermodynamic and extrathermodynamic parameters of activation have been calculated and discussed in terms of solvent effect on the ion-pair aquation reaction. The free energy of activation ∆Gip* is more or less linearly varied among the studied dicarboxylate ion-pairing ligands indicating the presence of compensation effect between ∆Hip* and ∆Sip*. Comparing the kip values with respect of different buffers at 40% of ter-butanol is introduced.

Solvent Effect Upon Dipole Moment and Proton Transfer Equilibrium in Ortho Mannich Bases

2010 ◽  
Vol 96 (6) ◽  
pp. 415-421 ◽  
Author(s):  
Z. Pawelka ◽  
M. Rospenk ◽  
L. Sobczyk
Keyword(s):  
Dipole Moment ◽  
Proton Transfer ◽  
Solvent Effect ◽  
Mannich Bases

Excited state proton transfer and photochromism of an aromatic Schiff base. Pico- and femtosecond kinetics of the N,N′-bis(salicylidene)-p-phenylenediamine (BSP)

2003 ◽  
Vol 369 (1-2) ◽  
pp. 80-89 ◽  
Author(s):  
Marcin Ziółek ◽  
Jacek Kubicki ◽  
Andrzej Maciejewski ◽  
Ryszard Naskrȩcki ◽  
Anna Grabowska
Keyword(s):  
Schiff Base ◽  
Excited State ◽  
Proton Transfer ◽  
Excited State Proton Transfer ◽  
Kinetics Of

Theoretical study of solvent effect on intramolecular proton transfer of glycine

2000 ◽  
Vol 531 (1-3) ◽  
pp. 267-282 ◽  
Author(s):  
E. Kassab ◽  
J. Langlet ◽  
E. Evleth ◽  
Y. Akacem
Keyword(s):  
Proton Transfer ◽  
Solvent Effect ◽  
Theoretical Study ◽  
Intramolecular Proton Transfer
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