Deep eutectic solvent

Catalysis

Choline chloride

Materials science

Sulfuryl chloride

Absorption (acoustics)

Succinonitrile

Solvent

Molecule

Inorganic chemistry

Physical chemistry

Chloride

Organic chemistry

Alloy

Eutectic system

Hexafluorophosphate

Composite material

Chemistry

Ionic liquid

Electrode

Electrolyte

Ethylene glycol

Hydrogen bond

ACS Sustainable Chemistry & Engineering

We report that deep eutectic solvents can be formed by biobased aprotic organic compound succinonitrile (SN) functionalized as the hydrogen bond donor with solid ionic liquid 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) or 1-ethyl-3-methylimidazolium hexafluorophosphate ([Emim][PF6]). The results suggested the formation of intermolecular hydrogen bonds between the anions of imidazolium salts and the C–H hydrogen of SN. Moreover, the deep eutectic solvent [Emim][Cl]-SN(1:1) exhibited an attractive SO2 absorption capacity (0.120 g SO2/g solvent) at low SO2 partial pressure (2000 ppm), which was more than two times the amount captured by [Emim][Cl]-ethylene glycol (EG)(1:1) (0.047 g SO2/g solvent) at the same conditions, although the concentration of [Emim][Cl] in [Emim][Cl]-SN(1:1) (64.7 wt %) was lower than that in [Emim][Cl]-EG(1:1) (70.3 wt %). The high SO2 absorption capacity of [Emim][Cl]-SN(1:1) was mainly because of the strong charge-transfer interaction between S of SO2 and Cl–, which was investigated by using Fourier transform infrared spectroscopy and theoretical calculations.

Efficient Absorption of SO<sub>2</sub> by Deep Eutectic Solvents Formed by Biobased Aprotic Organic Compound Succinonitrile and 1-Ethyl-3-methylimidazolium Chloride

Efficient Absorption of SO2 by Deep Eutectic Solvents Formed by Biobased Aprotic Organic Compound Succinonitrile and 1-Ethyl-3-methylimidazolium Chloride

Efficient Absorption of SO₂ by Deep Eutectic Solvents Formed by Biobased Aprotic Organic Compound Succinonitrile and 1-Ethyl-3-methylimidazolium Chloride