scholarly journals Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Sadhana Senapati ◽  
S. P. Das ◽  
A. K. Patnaik
Keyword(s):  
Electron Transfer ◽  
Ascorbic Acid ◽  
Acid Medium ◽  
Redox Reaction ◽  
Transfer Reaction ◽  
Total Concentration ◽  
Activation Parameters ◽  
Order Rate Constant ◽  
Electron Transfer Reaction ◽  
Reaction Products

Reduction of [PtCl6]2− by L-ascorbic acid (H2ASc) in 0.1 M aqueous acid medium has been investigated spectrophotometrically under pseudo-first order condition at [PtCl6]2− = 0.005–0.007 mol dm−3, 0.05 ≤ [H2ASc]/mol dm−3 ≤ 0.3, 298 K ≤ T ≤ 308 K, [H+] = 0.14 mol dm−3, I=0.5 mol dm−3. The redox reaction follows the rate law: d[Pt(IV)]/dt = k[H2ASc][Pt(IV)], where k is the second-order rate constant and [H2ASc] is the total concentration of ascorbic acid. Electron transfer from [H2ASc] to Pt(IV) center leading to the release of two halide ions and formation of the reaction products, square planner Pt(II) halide complex, and dehydrated ascorbic acid is suggested. This redox reaction follows an outersphere mechanism as Pt(IV) complex is substituted inert. Activation parameters were calculated corresponding to rate of electron transfer reaction k. Activation parameters favor the electron transfer reaction.

scholarly journals Kinetics and Mechanism of Electron Transfer Reaction of an Adipato Bridged Iron(III)-Salen Complex with Dithionite Ion in Perchloric Acid Medium

2015 ◽  
Vol 88 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Pius O. Ukoha ◽  
Simeon Atiga ◽  
Oguejiofo T. Ujam ◽  
Jonnie N. Asegbeloyin ◽  
Obinna C. Okpareke ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Acid Medium ◽  
Perchloric Acid ◽  
Transfer Reaction ◽  
Electron Transfer Reaction ◽  
Kinetics And Mechanism ◽  
Salen Complex ◽  
Dithionite Ion

scholarly journals Nonenzymatic NADH-Dependent Reduction of Keggin-Type 12-Tungstocobaltate(III) in Aqueous Medium

2011 ◽  
Vol 8 (3) ◽  
pp. 1152-1157
Author(s):  
Prabla Kumari ◽  
Alaka Das ◽  
Dillip Kumar Baral ◽  
A. K. Pattanaik ◽  
P. Mohanty
Keyword(s):  
Electron Transfer ◽  
Transition State ◽  
Aqueous Medium ◽  
Transfer Reaction ◽  
Activation Parameters ◽  
Electron Transfer Reaction ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
First Order ◽  
Kinetics Of

The kinetics of the electron transfer reaction of NADH with 12-tungstocobaltate(III) has been studied over the range 5.07 ≤ 104[NADH] ≤ 15.22 mol dm-3, 7.0 ≤ pH ≤ 8.0 and 20 ≤ t ≤ 35oC in aqueous medium. The electron transfer reaction showed first-order dependence each in [NADH]Tand [12-tungstocobaltate(III)]T. The products of the reaction were found to be NAD+and 12-tungstocobaltate(II). The activation parameters ΔH#(kJ mol-1) and ΔS#(JK-1mol-1) of the electron transfer reactions were found to be 64.4±1.8 and -48.86±6.0. Negative value of ΔS#is an indicative of an ordered transition state for the electron transfer reaction.

A novel radical polymerization system initiated by a redox reaction with NHPI and xanthone

2017 ◽  
Vol 8 (41) ◽  
pp. 6356-6361 ◽  
Author(s):  
Xu Yan ◽  
Lihua Zhang ◽  
Qian Liu ◽  
Guan Wang ◽  
Xiaofei Liu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Radical Polymerization ◽  
Redox Reaction ◽  
Transfer Reaction ◽  
Reaction System ◽  
Electron Transfer Reaction ◽  
Polymerization System

A novel redox reaction system consisting of xanthone (XT) andN-hydroxyphthalimide (NHPI) for radical polymerization is developed where NHPI and XT experience a one-electron-transfer reaction, which produces two kinds of radicals, PINO radicals and cycloketyl (CK) radicals.

Relative reactivities of dihydrophenazine and dihydrophenazonium radicals in electron-transfer to an azobenzene

1970 ◽  
Vol 48 (17) ◽  
pp. 2718-2721 ◽  
Author(s):  
Richard L. Reeves
Keyword(s):  
Electron Transfer ◽  
Sulfuric Acid ◽  
Kinetic Study ◽  
Rate Constant ◽  
Transfer Reaction ◽  
Order Rate Constant ◽  
Electron Transfer Reaction ◽  
Second Order ◽  
Aqueous Acetonitrile ◽  
Predominant Species

A kinetic study of the electron-transfer reaction between a model azobenzene and dihydrophenazonium ion-radical and dihydrophenazine was carried out in 0.2 N sulfuric acid in 50 v/v aqueous acetonitrile. The second-order rate constant for the dihydrophenazine is greater than that of the ion-radical by a factor of 104. It is shown that in solutions in which the ion-radical is the predominant species, the principal electron-transfer agent is the dihydrophenazine formed by dismutation of the radical.

scholarly journals Non enzymatic NADH-dependent reduction of Cis-[Co(en)2(H2O)2]3+ in aqueous medium

2018 ◽  
Vol 6 (2) ◽  
pp. 163
Author(s):  
Bharati Behera ◽  
Jashoda Behera
Keyword(s):  
Electron Transfer ◽  
Aqueous Medium ◽  
Transfer Reaction ◽  
Activation Parameters ◽  
Electron Transfer Reaction ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
First Order ◽  
Order Dependence ◽  
Kinetics Of

The kinetics of the electron transfer reaction of NADH with Cis-[Co(en)2(H2O)2]3+ has been studied over the range 1.0 ≤ 102 [NADH] ≤ 3.0 mol dm-3, 7.0 ≤ pH ≤ 8.0 and 200C ≤ t ≤ 350C in aqueous medium. The rate of electron transfer reaction was found to be first-order dependence each in [NADH]T and Cis-[Co(en)2(H2O)2]3+T. The products of the reaction were found to be NAD+ and Co(II). The corresponding activation parameters of the electron transfer reactions were found to be as ΔH#=27.55 kJ mol-1 and  ΔS#= -189.35 JK-1mol-1. 

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