The kinetics of neutral methyl viologen in acidic H2O+DMF mixed solutions studied by cyclic voltammetry |
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| Authors: | Ji Yoen Kim Chongmok Lee Joon Woo Park |
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| Affiliation: | Department of Chemistry, Ewha Womans University, Seoul 120-750, South Korea |
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| Abstract: | The chemistry of the two-electron reduction product of viologen (1,1′-dialkyl-4,4′-bipyridinium, V2+) neutral species, is important in understanding the electrochemical behavior of viologens and their utilization. The kinetics for the reactions of neutral methyl viologen (V0) in the presence of H+ (from HCl), CH3COOH (pKa=4.75), ClCH2CH2COOH (pKa=4.00), HCOOH (pKa=3.75) in aqueous media was examined by cyclic voltammetry according to the EECi mechanism. To avoid the electrodeposition of V0, we used a 9:1 (v/v%) H2O+DMF mixture as the solvent medium. To evaluate the rate constants for the chemical reaction followed by the second electron transfer step of V2+, the ratio of the anodic and cathodic peak current (Ipa2/Ipc2) corresponding to V0–e??V | |
| Keywords: | Neutral viologen Kinetics Cyclic voltammetry Rate constant Digital simulation |
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