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EC Mechanism (ec + mechanism)
Selected AbstractsSpectroelectrochemical and Voltammetric Studies of L -DOPAELECTROANALYSIS, Issue 2 2003Xiaoqiang Liu Abstract The electrooxidation of L -dopa at GC electrode was studied by in situ UV-vis spectroelectrochemistry (SEC) and cyclic voltammetry. The mechanism of electrooxidation and some reaction parameters were obtained. The results showed that the whole electrooxidation reaction of L -dopa at glassy carbon (GC) electrode was an irreversible electrochemical process followed by a chemical reaction in neutral solution (EC mechanism). The spectroelectrochemical data were treated by the double logarithm method together with nonlinear regression, from which the formal potential E0=228,mV, the apparent electron-transfer number of the electrooxidation reaction ,n=0.376 (R=0.99, SD=0.26), the standard electrochemical rate constant k0=(3.93±0.12)×10,4,cm s,1 (SD=1.02×10,2), and the formation equilibrium constant of the following chemical reaction kc=(5.38±0.34)×10,1,s,1 (SD=1.02×10,2) were also obtained. [source] Estimation of homogeneous rate constants of reaction of electrochemically generated ortho -benzoquinones with 1,3-indandioneINTERNATIONAL JOURNAL OF CHEMICAL KINETICS, Issue 11 2007Davood Nematollahi Electrochemical oxidation of some catechol derivatives has been studied in the presence of 1,3-indandione as nucleophile in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of electrochemically produced o -benzoquinones in the Michael reaction with 1,3-indandione to form the corresponding new catechol derivatives. On the basis of the EC mechanism, the observed homogeneous rate constants (kobs) of reaction of produced o -benzoquinones with 3-indandione were estimated by comparing the experimental cyclic voltammograms with the digitally simulated results. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 605,613, 2007 [source] Kinetic study of electrochemically induced Michael reactions of o -benzoquinones with 2-acetylcyclohexanone and 2-acetylcyclopentanoneJOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 1 2007Davood Nematollahi Abstract The reaction of electrochemically generated o -benzoquinones (2a-f) as Michael acceptors with 2-acetylcyclohexanone (ACH) and 2-acetylcyclopentanone (ACP), as nucleophiles has been studied in various pHs using cyclic voltammetry. The results indicate that the participation of o -benzoquinones (2a-f) in the Michael reaction with acetylcyclohexanone (ACH) to form the corresponding catechol derivatives (4a-f). Based on an EC mechanism, the homogeneous rate constants were estimated by comparing the experimental cyclic voltammetric responses with the digital simulated results. Copyright © 2007 John Wiley & Sons, Ltd. [source] Electrocatalytic oxidation of vitamin B6 by 4-hydroxy-2,2,6,6-tetramethylpiperidine- N -oxylCHINESE JOURNAL OF CHEMISTRY, Issue 11 2004Yan Li Abstract The electrochemistry of pyridoxine (vitamin B6, VB6) was studied by cyclic voltammetry at a glassy carbon electrode. The electrochemical response of VB6 could be significantly enhanced by using 4-hydroxy-2,2,6,6-tetra-methylpiperidine- N -oxyl (HO-TEMPO) as a mediator via an electrocatalytic EC' mechanism with the oxoammonium ion of HO-TEMPO as the active oxidant. The catalytic rate constant was determined to be 5.4×103 (mol*L,1),1*s,1 by using chronomperometq. [source] | ||||||||||