AI Article Synopsis
- The study investigates the electrochemical behavior of the anthracene-based azo dye azo-OMe, focusing on how its reduction potential varies with different organic acids and their pH levels.
- The analysis reveals that for organic acids with a pH between 8 and 20, the reduction potential of azo-OMe depends significantly on the acid's pH.
- Kinetic studies, including isotope effects, demonstrate that the reactions are limited by diffusion and that a simultaneous transfer of protons and electrons occurs during the reduction process, particularly with trifluoroacetic acid.
Article Abstract
Herein, we report the thermodynamics, kinetics, and mechanism for electrochemical proton-coupled electron transfer involving the anthracene-based azo dye azo-OMe. The peak reduction potential of azo-OMe with organic acids spanning the p range of 2.6-23.51 shows a dependence upon the p of the acid when the acid p falls between 8 and 20 (in acetonitrile). A potential-p diagram is constructed and used to estimate the p of the azo-OMe species. Heterogeneous electron-transfer rate constants are obtained using rotating disk electrode voltammetry in combination with Koutecký-Levich and Tafel analysis. Electrochemical analysis shows that the reactions are diffusion limited and are kinetically controlled by the electron-transfer step. Kinetic isotope studies indicate a concerted proton, electron transfer event occurs in the p -dependent range when using trifluoroacetic acid.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9052096 | PMC |
| http://dx.doi.org/10.1039/d0ra01643h | DOI Listing |
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