Electrochemical grafting of aryl diazonium salts in deep eutectic solvents

Deep eutectic solvents are seen as a new class of green and cheap solvents in electrochemical processes. Many electrochemical deposition techniques have been reported in the literature mainly focusing on metal electrodeposition and electro-polymerization. Here, we report for the first time the efficient electro-grafting of aryl diazonium salts on carbon surfaces using ethaline as an example of a natural and biodegradable deep eutectic solvent. Three different aryl diazonium salts have been tested, namely the 4-iodophenyldiazonium ion, 4-carboxymethylphenyl diazonium ion and 4-ethynylphenyldiazonium ion. Effect of concentration, deposition time and potential have been studied in relation to electrode blocking behavior toward redox probes in solution and deposited organic films thickness. Post-functionalization with redox active moieties is demonstrated on such electro-grafted organic layer to show their potential usefulness. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

This study reports the efficient electro-grafting of aryl diazonium salts on carbon surfaces using ethaline as a deep eutectic solvent, demonstrating potential applications. The effects of concentration, deposition time, and potential on electrode blocking behavior and deposited organic film thickness were investigated. Post-functionalization with redox active moieties was also demonstrated on the electro-grafted organic layer.