Quantum Chemistry Insight into the Interactions Between Deep Eutectic Solvents and SO₂.

Area of Science:

• Computational Chemistry
• Materials Science
• Environmental Chemistry

Background:

• Deep Eutectic Solvents (DES) offer potential as environmentally friendly alternatives to traditional solvents.
• Efficient sulfur dioxide (SO2) capture is crucial for reducing industrial emissions and mitigating environmental impact.
• Understanding molecular interactions is key to designing effective DES for gas capture.

Purpose of the Study:

• To investigate the molecular-level interactions between Deep Eutectic Solvents (DES) and sulfur dioxide (SO2).
• To provide insights for the rational design of task-specific DES with high SO2 affinity and solubility.
• To contribute to the development of efficient and sustainable SO2 capture technologies.

Main Methods:

• Density Functional Theory (DFT) simulations were employed to study 11 selected DES structures.
• Analysis included quantum theory of atoms in a molecule (QTAIM), electrostatic potentials (ESP), and reduced density gradients (RDG).
• Investigated key interaction parameters governing SO2 solubility and affinity within DES.

Main Results:

• Detailed information on the type and intensity of interactions between DES and SO2 molecules was generated.
• Quantified short-range interactions at various molecular sites within the DES structures.
• Identified crucial factors at the molecular level for achieving high SO2 solubility in DES.

Conclusions:

• The study enhances understanding of molecular interactions for designing task-specific DES.
• Findings support the development of more efficient and environmentally friendly SO2 capture processes.
• Results pave the way for industrial implementation of DES in chemical processes.