Electrochemical grafting of aryl diazonium salts in deep eutectic solvents

Abstract

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, 4carboxymethylphenyl 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.

Lewis acidic deep eutectic solvents as catalysts for rosin polymerization

“…10–13 However, these catalysts also have some disadvantages in industrial applications, such as easy inactivation and insufficient recycling performance for solid superacids, and high cost and a tedious preparation process for ionic liquids. 14–16 Therefore, it is vital to develop a simple and efficient green catalyst for rosin polymerization.…”

Copper-Free Halodediazoniation of Arenediazonium Tetrafluoroborates in Deep Eutectic Solvents-like Mixtures

“…Despite the increasing use of DESs in organic synthesis [ 4 , 5 , 6 ], they have scarcely been utilized in the reactions of diazonium salts. In fact, the literature shows only three very recent examples, where DESs are employed as innocent solvents [ 7 , 8 , 9 ].…”

Highly efficient and reversible adsorption of ammonia by incorporation of deep eutectic solvents into silica gel and Al2O3

“…In the past two decades, deep eutectic solvents (DESs) composed of a hydrogen bond donor (HBD) and hydrogen bond acceptor (HBA), a kind of IL analogue, have been applied in many fields including electrochemistry, 41,42 organic reaction, 43,44 material synthesis 45 and gas absorption. [46][47][48] Compared with ILs, DESs have extra features of simple preparation, low cost, sustainability and biodegradability.…”