TEMPO-Modified Polymethacrylates as Mediators in Electrosynthesis: Influence of the Molecular Weight on Redox Properties and Electrocatalytic Activity

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Date
2023
Volume
29
Issue
11
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Publisher
Weinheim : Wiley-VCH
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Abstract

Homogeneous catalysts (“mediators”) are frequently employed in organic electrosynthesis to control selectivity. Despite their advantages, they can have a negative influence on the overall energy and mass balance if used only once or recycled inefficiently. Polymediators are soluble redox-active polymers applicable as electrocatalysts, enabling recovery by dialysis or membrane filtration. Using anodic alcohol oxidation as an example, we have demonstrated that TEMPO-modified polymethacrylates (TPMA) can act as efficient and recyclable catalysts. In the present work, the influence of the molecular size on the redox properties and the catalytic activity was carefully elaborated using a series of TPMAs with well-defined molecular weight distributions. Cyclic voltammetry studies show that the polymer chain length has a pronounced impact on the key-properties. Together with preparative-scale electrolysis experiments, an optimum size range was identified for polymediator-guided sustainable reaction control.

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Keywords
electrocatalysis, electrosynthesis, mediators, redox-active polymers, TEMPO
Citation
Prudlik, A., Mohebbati, N., Hildebrandt, L., Heck, A., Nuhn, L., & Francke, R. (2023). TEMPO-Modified Polymethacrylates as Mediators in Electrosynthesis: Influence of the Molecular Weight on Redox Properties and Electrocatalytic Activity. 29(11). https://doi.org//10.1002/chem.202202730
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CC BY-NC-ND 4.0 Unported