scholarly journals Kinetics and Mechanism of Oxidation of Leucine and Alanine by Ag(III) Complex in Alkaline Medium

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Changying Song ◽  
Lei Chen ◽  
Jinhuan Shan
Keyword(s):  
Amino Acids ◽  
Alkaline Medium ◽  
Activation Parameters ◽  
Order Rate Constant ◽  
Kinetics And Mechanism ◽  
Rate Equations ◽  
Kinetics Study ◽  
First Order ◽  
Plausible Mechanism ◽  
Mechanism Of Oxidation

Kinetics and mechanism of oxidation of leucine and alanine by Ag(III) complex were studied spectrophotometrically in alkaline medium at constant ion strength. The reaction was in first order with respect to Ag(III) complex and amino acids (leucine, alanine). The second-order rate constant, k−, decreased with the increasing in [OH−] and [IO4−]. A plausible mechanism was proposed from the kinetics study, and the rate equations derived from mechanism can explain all experimental phenomena. The activation parameters were calculated at 298.2 K.

scholarly journals Kinetics and mechanism of the oxidation of polyhydric alcohols by dihydroxyditelluratoargentate(III) in alkaline medium

2005 ◽  
Vol 70 (4) ◽  
pp. 585-592 ◽  
Author(s):  
J.H. Shan ◽  
S.Y. Huo ◽  
S.G. Shen ◽  
H.W. Sun
Keyword(s):  
Alkaline Medium ◽  
Activation Parameters ◽  
Order Rate Constant ◽  
Active Species ◽  
Rate Equations ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Rate Determining Step ◽  
Plausible Mechanism ◽  
Kinetics Of

The kinetics of oxidation of 1,2-propanediol and 1,2,3-propanetriol by dihydroxyditelluratoargentate(III) (DDA) were studied spectrophotometrically between 298.2 K and 313.2 K in alkaline medium. The reaction rate showed first order dependence on DDA and 1 < nap < 2 order on the reductant. It was found that the pseudo-first order rate constant kobs increased with increasing concentration of OH-1 and decreasing concentration of TeO42-. There is a negative salt effect and no free radicals were detected. In view of this, the dihydroxymonotelluratoargentate(III) species is assumed to be the active species. A plausible mechanism involving a two-electron transfer is proposed and the rate equations derived from the mechanism can explain all the experimental results. The activation parameters, as well as the rate constants of the rate-determining step were calculated.

scholarly journals Kinetics and Mechanism of Oxidation of Isobutylamine and 1,4-Butanediamine by Potassium Ferrate

2011 ◽  
Vol 8 (3) ◽  
pp. 1371-1377
Author(s):  
Shan Jinhuan ◽  
Yang Yafeng
Keyword(s):  
Activation Parameters ◽  
Rate Equations ◽  
Potassium Ferrate ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Rate Determining Step ◽  
Thermodynamic Activation Parameters ◽  
Plausible Mechanism ◽  
Mechanism Of Oxidation ◽  
Kinetics Of

The kinetics of oxidation of isobutylamine and 1,4-butanediamine by home-made potassium ferrate(VI) at different conditions has been studied spectrophotometrically in the temperature range of 288.2 -303.2 K. The results show first order dependence on potassium ferrate(VI) and on each reductant. The observed rate constant (kobs) decreases with the increase of [OH-], the reaction was negative fraction order with respect to [OH-]. A plausible mechanism was proposed and the rate equations derived from the mechanism can explain all the experimental results. The rate constants of the rate-determining step and the thermodynamic activation parameters were calculated.

scholarly journals Kinetics and Mechanism of Oxidation of Triethylene Glycol and Tetraethylene Glycol by Ditelluratoargentate (III) in Alkaline Medium

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Jinhuan Shan ◽  
Caihong Yin
Keyword(s):  
Activation Parameters ◽  
Triethylene Glycol ◽  
Order Rate Constant ◽  
Rate Equations ◽  
Tetraethylene Glycol ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Rate Determining Step ◽  
Plausible Mechanism ◽  
Kinetics Of

The kinetics of oxidation of triethylene glycol and tetraethylene glycol by ditelluratoargentate (III) (DTA) in alkaline liquids has been studied spectrophotometrically in the temperature range of 293.2 K–313.2 K. The reaction rate showed first-order dependence in DTA and fractional order with respect to triethylene glycol or tetraethylene glycol. It was found that the pseudo-first-order rate constant(kobs)increased with an increase in concentration of OH−and a decrease in concentration ofH4TeO6 2−. There was a negative salt effect and no free radicals were detected. A plausible mechanism involving a two-electron transfer was proposed, and the rate equations derived from the mechanism explained all the experimental results and observations. The activation parameters along with the rate constants of the rate-determining step were calculated.

scholarly journals Kinetics and Mechanism of Oxidation of Diethanolamine and Triethanolamine by Potassium Ferrate

2011 ◽  
Vol 8 (2) ◽  
pp. 903-909 ◽  
Author(s):  
Shan Jinhuan ◽  
Zhang Jiying
Keyword(s):  
Activation Parameters ◽  
Rate Equations ◽  
Potassium Ferrate ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Order Dependence ◽  
Rate Determining Step ◽  
Thermodynamic Activation Parameters ◽  
Plausible Mechanism ◽  
Kinetics Of

The kinetics of oxidation of diethanolamine and triethanolamine by potassium ferrate(VI)in alkaline liquids at a constant ionic strength has been studied spectrophotometrically in the temperature range of 278.2K-293.2K. The reaction shows first order dependence on potassium ferrate(VI), first order dependence on each reductant, The observed rate constant (kobs) decreases with the increase in [OH-], the reaction is negative fraction order with respect to [OH-]. A plausible mechanism is proposed and the rate equations derived from the mechanism can explain all the experimental results. The rate constants of the rate-determining step and the thermodynamic activation parameters are calculated.

scholarly journals Kinetics and Mechanism of Oxidation ofL-Cystine by Hexacyanoferrate(III) in Alkaline Medium

2009 ◽  
Vol 6 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Annapurna Nowduri ◽  
Kalyan Kumar Adari ◽  
Nageswara Rao Gollapalli ◽  
Vani Parvataneni
Keyword(s):  
Alkaline Medium ◽  
Oxidation Product ◽  
Experimental Results ◽  
Cysteic Acid ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Order Dependence ◽  
Plausible Mechanism ◽  
Mechanism Of Oxidation ◽  
Kinetics Of

Kinetics of oxidation ofL-cystine by hexacyanoferrate(III) was studied in alkaline medium at 30 °C. The reaction was followed spectrophotometrically at λmax = 420 nm. The reaction was found to be first order dependence each on [HCF(III)] and [cystine]. It was found that the rate of the reaction increases with increase in [OH-]. The oxidation product of the reaction was found to be cysteic acid. A plausible mechanism has been proposed to account for the experimental results.

scholarly journals Kinetics and Mechanism of Oxidation of Hexamethylenediaminetetraacetatocobaltate(II) Complex by Periodate Ion in Aqueous Medium

2010 ◽  
Vol 7 (s1) ◽  
pp. S391-S399
Author(s):  
R. M. Naik ◽  
B. Kumar J. Rai ◽  
R. Rastogi ◽  
S. B. S. Yadav
Keyword(s):  
Reaction Pathway ◽  
Activation Parameters ◽  
Electron Transfer Reaction ◽  
Kinetics And Mechanism ◽  
Oxidation Of Co ◽  
Deprotonated Form ◽  
First Order ◽  
Pseudo First Order ◽  
Mechanism Of Oxidation ◽  
Aqueous Acidic Medium

The kinetics and mechanism of oxidation of [CoIIHDTA]4-(Where HDTA=Hexamethylenediamine tetraacetic acid} by periodate ion has been studied in aqueous acidic medium. The reactions has been investigated spectrophotometrically at λmax= 580 nm under pseudo- first -order condition by taking large excess of oxidant [IO4] at pH = 4.0±0.02, I = 0.1 M (CH3COONa + NaNO3).and temperature = 30± 0.1°C The electron transfer reaction between [CoIIHDTA]4-and [IO4-] obeys inner sphere reaction pathway through the formation of long-lived intermediate complex which finally get converted into a corresponding [CoIIIHDTA]3-complex as final reaction product. The experimental observations have shown that the reaction obey first- order dependence in [CoIIHDTA]4--. The variation of pseudo-first-order rate constants (kobs) with[IO4-], keeping other reaction variables fixed at constant value was found to obey the rate law: kobs=a[IO4-]2/b+c[IO4-], which is consistent with a three step mechanistic scheme. The values of kobsare almost constant with increasing pH, which can be attributed to the reaction of deprotonated form of [CoIIIHDTA]4-complex only, in the entire pH region. Eyring’s equation has been used to calculate the thermal or activation parameters and found to be, ΔH#= 28.69 kJ mole–1; ΔS#= – 481.13 J K-1mole–1respectively and support the proposed mechanistic scheme.

scholarly journals Kinetics and Mechanism of Oxidation of Sucrose by N-Bromonicotinamide NBN

2015 ◽  
Vol 57 ◽  
pp. 95-101
Author(s):  
L. Pushpalatha
Keyword(s):  
Ionic Strength ◽  
Glycolic Acid ◽  
Activation Parameters ◽  
Zero Order ◽  
Effect Of Temperature ◽  
Kinetics Study ◽  
Reactive Intermediate ◽  
Aqueous Alkaline Solution ◽  
First Order ◽  
Mechanism Of Oxidation

Kinetics study of oxidation of sucrose, by aqueous alkaline solution of N-Bromonicotinamide (NBN) has been carried out in the temperature range 308-323K.The reaction exhibits first order in [NaOH] and [Sucrose] and zero order about oxidant. Addition of nicotinamide (NA) has no effect. Increase in ionic strength of the medium does not change the rate. Effect of temperature on the rate of oxidation has been followed to show the validity of Arrehenius equation and various activation parameters have been computed. The stoichiometry of the reaction was found to be 1:1. 1,2-enediol is found to be the reactive intermediate. Arabinonic acid, glycolic acid and formic acid are the products of oxidation.

scholarly journals Kinetics and Mechanism of Oxidation of Carbenicillin by Copper (III) Periodate Complex in Aqueous Alkaline Medium

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yuv Raj Sahu ◽  
Parashuram Mishra
Keyword(s):  
Alkaline Medium ◽  
Equilibrium Constants ◽  
Active Species ◽  
Kinetics And Mechanism ◽  
Slow Step ◽  
Aqueous Alkaline Medium ◽  
Reaction Products ◽  
Ft Ir ◽  
Plausible Mechanism ◽  
Mechanism Of Oxidation

Kinetics and mechanism of oxidation of carbenicillin by diperiodatocuprate [DPC-III] in aqueous alkaline medium were studied spectrophotometrically at 298 K and an ionic strength of 0.10 mol·dm−3. The reaction between DPC (III) and carbenicillin in the alkaline medium showed (CRBC : DPC-III) 1 : 4 stoichiometry. The reaction products were identified by the CHNS test, FT-IR, and LC-MS spectral reports. The reaction was of pseudo-first order with respect to DPC (III) and fractional order with respect to carbenicillin as well as alkali but retarding effect with respect to periodate. Monoperiodatocuprate (MPC-III) was found to be the main active species in the alkaline medium in the form of [Cu (H2IO6) (H2O)2]. Activation and thermodynamic parameters with respect to uncatalyzed rate constants (ku) and slow step rate constant (k) as well as equilibrium constants were determined. The plausible mechanism consistent with experimental results was proposed and discussed in detail.

Kinetics and Mechanism of Oxidation of Labetalol by Hexacyanoferrate(III) in Alkaline Medium

2012 ◽  
Vol 3 (2) ◽  
pp. 131-133
Author(s):  
ANNAPURNA NOWDURI ◽  
◽  
Apparao Babu Duggada ◽  
Vijaya Raju Kurimella
Keyword(s):  
Alkaline Medium ◽  
Kinetics And Mechanism ◽  
Mechanism Of Oxidation
Sign in / Sign up

Export Citation Format

Share Document