Abstract
Nowadays, the development of modern chemical technology and engineering is aimed at the concept of greening and implementation of "green" technologies. Therefore, the study of deep eutectic solvents (DES), which arecheap and environmentally friendly, is of particular importance. DES are a class of novel green solventswith a wide range of properties and applications. In the work, 6 solvents were synthesized using choline chloride, lactic acid, proline, betaine, propanol, and urea. These constituents jointly determine the nature of the synthesized DESs and their electrochemical behavior. The knowledge of physicochemical, electrochemical properties of DESs is also valuable to DESs practical applications. Electrical conductivity indicates the strength with which DESs can conduct electricity. The focus of the investigation is physicochemical properties (electrical conductivity, electrochemical window) deep eutectic solvents (DESs). The formation of hydrogen bonds between the components was confirmed and the electrochemical characteristics of the synthesized ionic liquids were determined. The conducted studies showed that urea and lactic acid arethe most suitable compounds for the formation of DES. DESs have been synthesized using choline chloride, Betaine and Proline as hydrogen bond acceptors (HBAs). Choline chloride-urea, Choline chloride-lactic acid, Sodium acetate-lactic acid, Choline chloride-propanediol, Proline-lactic acid, Betaine-lactic acid were synthesized. The electrical conductivity of deep eutectic solvents was measured and the width of the electrochemical window was evaluated using cycling voltammetry. FTIR-ATR was carried out to confirm the formation of the DESs. FT-IR results confirmed that H-bonds, occurring between two components in DES, were the main force leading to the eutectic formation. Adding water in quantity 1...25% leads to a decrease in the width of the electrochemicalwindow from 1.33to 1.21 V and increase in electrical conductivity from 0.39 to 2.07 S/m.
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