Mécanisme des réactions du chlorite et du dioxyde de chlore. 3. La dismutation du chlorite

1985 ◽  
Vol 63 (4) ◽  
pp. 975-980 ◽  
Author(s):  
Guy Schmitz ◽  
Henri Rooze
Keyword(s):  
Ionic Strength ◽  
Order Reaction ◽  
Second Order ◽  
Acid Solutions ◽  
Chain Mechanism ◽  
Second Order Reaction ◽  
Radical Chain ◽  
Rate Law ◽  
The Third ◽  
Reaction Proceeds

The disproportionation of chlorite was studied in 0.01 to 1 M perchloric acid solutions at 25 °C and an ionic strength of 1 M. The results suggest at least three reaction paths. The first is catalysed by Cl− ions, the second gives a second-order rate law, and the third is catalysed by iron. Its rate law is[Formula: see text]This can be interpreted by the reversible reaction [Formula: see text] followed by two rate-determining reactions Fe2+ + HClO2 → products, [Formula: see text] From this study and the former, made with added ortho-tolidine, we conclude that the second-order reaction proceeds by a radical chain mechanism.

KINETIC LAWS FOR SURFACE REACTIONS IN FLOW SYSTEMS

1958 ◽  
Vol 36 (7) ◽  
pp. 1081-1088 ◽  
Author(s):  
K. J. Laidler
Keyword(s):  
Catalyst Surface ◽  
Order Reaction ◽  
Second Order ◽  
Graphical Form ◽  
Second Order Reaction ◽  
First Order ◽  
General Differential Equation ◽  
Special Cases ◽  
Reaction Proceeds ◽  
Set Up

A general differential equation is set up for the flow of reactant gases through a catalytic reactor, account being taken of changes in volume as the reaction proceeds and of the possibility that the catalyst surface is not completely available. Integrated solutions are given for three special cases and are presented in graphical form: (1) first-order reaction, the result being applicable whether the surface is completely available or not (Fig. 1); (2) second-order reaction with the surface completely available (Fig. 2); (3) second-order reaction with only a small fraction of the surface available (Fig. 3). The treatment is related to previous treatments of Hulburt, Thiele, and Wheeler.

Stability of radical anions derived from substituted 5-nitrofurans investigated by ESR spectroscopy

1985 ◽  
Vol 50 (7) ◽  
pp. 1594-1601 ◽  
Author(s):  
Jiří Klíma ◽  
Larisa Baumane ◽  
Janis Stradinš ◽  
Jiří Volke ◽  
Romualds Gavars
Keyword(s):  
Radical Anion ◽  
High Stability ◽  
Esr Spectroscopy ◽  
Reaction Path ◽  
Order Reaction ◽  
Second Order ◽  
Radical Anions ◽  
Second Order Reaction ◽  
Unpaired Electron Density ◽  
The Stability

It has been found that the decay in dimethylformamide and dimethylformamide-water mixtures of radical anions in five of the investigated 5-nitrofurans is governed by a second-order reaction. Only the decay of the radical anion generated from 5-nitro-2-furfural III may be described by an equation including parallel first- and second-order reactions; this behaviour is evidently caused by the relatively high stability of the corresponding dianion, this being an intermediate in the reaction path. The presence of a larger conjugated system in the substituent in position 2 results in a decrease of the unpaired electron density in the nitro group and, consequently, an increase in the stability of the corresponding radical anions.

Kinetics of the reaction between hexamethylenediisocyanate and 1-pentanol

1983 ◽  
Vol 48 (11) ◽  
pp. 3279-3286
Author(s):  
Slavko Hudeček ◽  
Miloslav Bohdanecký ◽  
Ivana Hudečková ◽  
Pavel Špaček ◽  
Pavel Čefelín
Keyword(s):  
Liquid Chromatography ◽  
Rate Constants ◽  
Reversed Phase ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Reversed Phase Liquid Chromatography ◽  
Consecutive Reactions ◽  
Phase Liquid ◽  
Kinetics Of

The reaction between hexamethylenediisocyanate and 1-pentanol in toluene was studied by means of reversed-phase liquid chromatography. By employing this method, it was possible to determine all components of the reaction mixture including both products, i.e. N-(6-isocyanate hexyl)pentylcarbamate and N,N'-bis(pentyloxycarbonyl)hexamethylenediamine. Relations for the calculation of kinetic constants were derived assuming a competitive consecutive second-order reaction. It was demonstrated that the reaction involved in this case is indeed a second-order reaction, and the rate constants of the first and second consecutive reactions were determined.

Analytical resolution of a parallel second-order reaction mechanism

2003 ◽  
Vol 35 (6) ◽  
pp. 246-251
Author(s):  
A. E. Croce ◽  
L. V. Mogni ◽  
C. Vicente Irrazábal
Keyword(s):  
Reaction Mechanism ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Analytical Resolution

scholarly journals Ribonucleic acid–deoxyribonucleic acid hybridization as a second-order reaction

1973 ◽  
Vol 135 (3) ◽  
pp. 573-576 ◽  
Author(s):  
Bryan D. Young ◽  
John Paul
Keyword(s):  
Dna Hybridization ◽  
Ribonucleic Acid ◽  
Deoxyribonucleic Acid ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Reaction Theory

Certain features of RNA–DNA hybridization can be accounted for in terms of second-order-reaction theory. These include the use of annealing kinetics to estimate RNA complexity and the occurrence of approximately linear double-reciprocal plots.

scholarly journals SOLVATION OF THE [Cr(NCS)4(IMIDAZOLE)2] ION IN ETHANOL-WATER MIXTURES

2002 ◽  
Vol 10 (11) ◽  
pp. 63-72
Author(s):  
lon Ganescu ◽  
George Bratulescu ◽  
Ion Papa ◽  
Anca Ganescu ◽  
Alin Barbu ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Order Reaction ◽  
Water Molecules ◽  
Hydrogen Ions ◽  
Second Order Reaction ◽  
Acidic Solutions ◽  
The Third ◽  
Competitive Reactions ◽  
Different Temperatures ◽  
Kinetics Of

Salvation kinetics of [Cr(NCS)4(imidazole)2]- has been studied in ethanol-water mixtures at different temperatures. The first stage of the solvation consists of two competitive reactions: two NCS- ions are exchanged, presumably, by water molecules and simultaneously an imidazole molecule by ethanol, the latter in a second-order reaction, accelerated by hydrogen ions. The exchange of the amine is followed by the substitution of the first two NCS- ions. The third and fourth NCS- ions are substituted only in neutral and slightly acidic solutions. Kinetic parameters have been determined for reactions (1), (2), and (4). The influence of the solvent composition and acidity is discussed

Sign in / Sign up

Export Citation Format

Share Document