Abstract
Structure-Physical Properties Relationship of Eutectic Solvents Prepared from Benzyltriethylammonium Chloride and Carboxylic Acids
Highlights
Deep eutectic solvents (DESs) prepared from malonic, anhydrous or hydrated oxalic acid as hydrogen bonding donor (HBD) and choline chloride as quaternary ammonium salt (QAS) has been applied in the pretreatment, extraction, catalysis of biomass and food waste and the results show environmental and economic benefits.[1]
Harmonic frequencies were calculated to ensure that all optimized structures are minima in potential energy. 1H and 13C nuclear magnetic resonance (NMR) spectra were recorded on a Bruker Avance II 400 (1H at 399.01 MHz and 13C at 100.33 MHz) at 45 °C in a 5 mm sample tubes in dimethyl sulfoxide/tetramethylsilane (DMSO-d6/TMS) solutions. 35Cl NMR experiments were recorded on a Bruker Avance II 400 (35Cl at 39.14 MHz) at 45 °C in 5 mm sample tubes in DMSO-d6 using KClO4 as standard
Four eutectic solvents were prepared from benzyltriethylammonium chloride (BTEAC) and oxalic acid dihydrate, oxalic acid, malonic acid and benzoic acid at a 1:1 molar ratio to evaluate the effect of HBDs structure on physical properties
Summary
Viscosity, and refractive index were affected by the nature of the HBD and proved that molar ratio variation or structural changes in HBD allowed the preparation of a range of DESs with tunable properties.[8] DESs prepared from malonic, anhydrous or hydrated oxalic acid as HBD and choline chloride as QAS has been applied in the pretreatment, extraction, catalysis of biomass and food waste and the results show environmental and economic benefits.[1] In this context, the preparation of new type III DESs from carboxylic acids and quaternary ammonium salts can contribute to improving the results in the mentioned areas
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