Investigating Comproportionation in Multielectron Transfers via UV–Visible Spectroelectrochemistry: The Electroreduction of Anthraquinone-2-sulfonate in Aqueous Media,Analytical Chemistry

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Investigating Comproportionation in Multielectron Transfers via UV–Visible Spectroelectrochemistry: The Electroreduction of Anthraquinone-2-sulfonate in Aqueous Media
Analytical Chemistry ( IF 6.7 ) Pub Date : 2022-08-22 , DOI: 10.1021/acs.analchem.2c02523
Luis Romay ₁ , Joaquín González ₁ , Ángela Molina ₁ , Eduardo Laborda ₁

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UV–vis spectroelectrochemistry is assessed as a tool for the diagnosis and quantitative in situ investigation of the incidence of comproportionation in multielectron transfer processes. Thus, the sensitivity of the limiting current chronoabsorptometric signals related to the different redox states to the comproportionation kinetics is studied theoretically for different working modes (normal and parallel light beam arrangements) and mass transport regimes (from semi-infinite to thin layer diffusion). The theoretical results are applied to the spectroelectrochemical study of the two-electron reduction of the anthraquinone-2-sulfonate in alkaline aqueous solution, tuning the thermodynamic favorability of the comproportionation reaction through the electrolyte cation. The quantitative analysis of the experimental results reveals the occurrence of comproportionation in the three media examined, showing different kinetics depending on the cationic species in solution.

中文翻译：

通过紫外-可见光谱电化学研究多电子转移中的比例化：蒽醌-2-磺酸盐在水介质中的电还原

紫外-可见分光电化学被评估为原位诊断和定量的工具研究多电子转移过程中的比例化发生率。因此，对于不同的工作模式（正常和平行光束排列）和质量传输机制（从半无限到薄层扩散），理论上研究了与不同氧化还原状态相关的极限电流计时吸收信号对比例动力学的敏感性。理论结果应用于蒽醌-2-磺酸盐在碱性水溶液中双电子还原的光谱电化学研究，通过电解质阳离子调节了歧化反应的热力学有利性。实验结果的定量分析揭示了三种介质中比例的发生，

更新日期：2022-08-22

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